colour.colorimetry Package¶

Sub-Packages¶

colour.colorimetry.dataset Package

Sub-Modules¶

Module Contents¶

class colour.colorimetry.SpectralMapping(data=None, wavelength_decimals=10, **kwargs)[source]¶

Bases: colour.utilities.data_structures.ArbitraryPrecisionMapping

Defines the base mapping for spectral data.

It enables usage of floating point wavelengths as keys by rounding them at a specific decimals count.

Other Parameters:
Parameters:	data (dict or SpectralMapping, optional) – Spectral data in a dict or SpectralMapping as follows: {wavelength $\lambda_{i}$: value, wavelength $\lambda_{i+1}$: value, ..., wavelength $\lambda_{i+n}$: value} wavelength_decimals (int, optional) – Decimals count the keys will be rounded at.
	*kwargs (dict, optional*) – Key / Value pairs to store into the mapping at initialisation.

wavelength_decimals¶

Examples

>>> data1 = {380.1999999998: 0.000039, 380.2000000000: 0.000039}
>>> mapping = SpectralMapping(data1, wavelength_decimals=10)
>>> # Doctests skip for Python 2.x compatibility.
>>> tuple(mapping.keys())  
(380.1999999..., 380.2)
>>> mapping = SpectralMapping(data1, wavelength_decimals=7)
>>> # Doctests skip for Python 2.x compatibility.
>>> tuple(mapping.keys())  
(380.2,)

wavelength_decimals

Property for self.key_decimals attribute.

Returns:	self.key_decimals.
Return type:	unicode

class colour.colorimetry.SpectralShape(start=None, end=None, interval=None)[source]¶

Bases: object

Defines the base object for spectral power distribution shape.

Parameters:	start (numeric, optional) – Wavelength $\lambda_{i}$ range start in nm. end (numeric, optional) – Wavelength $\lambda_{i}$ range end in nm. interval (numeric, optional) – Wavelength $\lambda_{i}$ range interval.

start¶

end¶

interval¶

boundaries¶

__str__()[source]¶

__repr__()[source]¶

__iter__()[source]¶

__contains__()[source]¶

__len__()[source]¶

__eq__()[source]¶

__ne__()[source]¶

range()[source]¶

Examples

>>> # Doctests skip for Python 2.x compatibility.
>>> SpectralShape(360, 830, 1)  
SpectralShape(360, 830, 1)

boundaries

Property for self._start and self._end private attributes.

Returns:	self._start, self._end.
Return type:	tuple

end

Property for self._end private attribute.

Returns:	self._end.
Return type:	numeric

interval

Property for self._interval private attribute.

Returns:	self._interval.
Return type:	numeric

range()[source]

Returns an iterable range for the spectral power distribution shape.

Returns:	Iterable range for the spectral power distribution shape
Return type:	ndarray
Raises:	`RuntimeError` – If one of spectral shape start, end or interval attributes is not defined.

Examples

>>> SpectralShape(0, 10, 0.1).range()
array([  0. ,   0.1,   0.2,   0.3,   0.4,   0.5,   0.6,   0.7,   0.8,
         0.9,   1. ,   1.1,   1.2,   1.3,   1.4,   1.5,   1.6,   1.7,
         1.8,   1.9,   2. ,   2.1,   2.2,   2.3,   2.4,   2.5,   2.6,
         2.7,   2.8,   2.9,   3. ,   3.1,   3.2,   3.3,   3.4,   3.5,
         3.6,   3.7,   3.8,   3.9,   4. ,   4.1,   4.2,   4.3,   4.4,
         4.5,   4.6,   4.7,   4.8,   4.9,   5. ,   5.1,   5.2,   5.3,
         5.4,   5.5,   5.6,   5.7,   5.8,   5.9,   6. ,   6.1,   6.2,
         6.3,   6.4,   6.5,   6.6,   6.7,   6.8,   6.9,   7. ,   7.1,
         7.2,   7.3,   7.4,   7.5,   7.6,   7.7,   7.8,   7.9,   8. ,
         8.1,   8.2,   8.3,   8.4,   8.5,   8.6,   8.7,   8.8,   8.9,
         9. ,   9.1,   9.2,   9.3,   9.4,   9.5,   9.6,   9.7,   9.8,
         9.9,  10. ])

start

Property for self._start private attribute.

Returns:	self._start.
Return type:	numeric

class colour.colorimetry.SpectralPowerDistribution(name, data, title=None)[source]¶

Bases: object

Defines the base object for spectral data computations.

Parameters:	name (unicode) – Spectral power distribution name. data (dict or SpectralMapping) – Spectral power distribution data in a dict or SpectralMapping as follows: {wavelength $\lambda_{i}$: value, wavelength $\lambda_{i+1}$: value, ..., wavelength $\lambda_{i+n}$: value} title (unicode, optional) – Spectral power distribution title for figures.

Notes

Underlying spectral data is stored within a colour.SpectralMapping class mapping which implies that wavelengths keys will be rounded.

name¶

data¶

title¶

wavelengths¶

values¶

items¶

shape¶

__str__()[source]¶

__repr__()[source]¶

__hash__()[source]¶

__init__()[source]¶

__getitem__()[source]¶

__setitem__()[source]¶

__iter__()[source]¶

__contains__()[source]¶

__len__()[source]¶

__eq__()[source]¶

__ne__()[source]¶

__add__()[source]¶

__iadd__()[source]¶

__sub__()[source]¶

__isub__()[source]¶

__mul__()[source]¶

__imul__()[source]¶

__div__()[source]¶

__idiv__()[source]¶

__pow__()[source]¶

__ipow__()[source]¶

get()[source]¶

is_uniform()[source]¶

extrapolate()[source]¶

interpolate()[source]¶

align()[source]¶

trim_wavelengths()[source]¶

zeros()[source]¶

normalise()[source]¶

clone()[source]¶

Examples

>>> data = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> # Doctests skip for Python 2.x compatibility.
>>> spd.wavelengths  
array([510, 520, 530, 540])
>>> spd.values
array([ 49.67,  69.59,  81.73,  88.19])
>>> spd.shape  
SpectralShape(510, 540, 10)

align(shape, interpolation_method=None, extrapolation_method=u'Constant', extrapolation_left=None, extrapolation_right=None)[source]

Aligns the spectral power distribution to given spectral shape: Interpolates first then extrapolates to fit the given range.

Parameters:	shape (SpectralShape) – Spectral shape used for alignment. interpolation_method (unicode, optional) – {None, ‘Cubic Spline’, ‘Linear’, ‘Pchip’, ‘Sprague’}, Enforce given interpolation method. extrapolation_method (unicode, optional) – {‘Constant’, ‘Linear’}, Extrapolation method. extrapolation_left (numeric, optional) – Value to return for low extrapolation range. extrapolation_right (numeric, optional) – Value to return for high extrapolation range.
Returns:	Aligned spectral power distribution.
Return type:	SpectralPowerDistribution

Examples

>>> data = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 86.26,
...     560: 77.18}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> print(spd.align(SpectralShape(505, 565, 1)))
SpectralPowerDistribution('Sample', (505.0, 565.0, 1.0))
>>> # Doctests skip for Python 2.x compatibility.
>>> spd.wavelengths  
array([505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517,
       518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530,
       531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543,
       544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556,
       557, 558, 559, 560, 561, 562, 563, 564, 565])
>>> spd.values  
array([ 49.67     ...,  49.67     ...,  49.67     ...,  49.67     ...,
        49.67     ...,  49.67     ...,  51.8341162...,  53.9856467...,
        56.1229464...,  58.2366197...,  60.3121800...,  62.3327095...,
        64.2815187...,  66.1448055...,  67.9143153...,  69.59     ...,
        71.1759958...,  72.6627938...,  74.0465756...,  75.3329710...,
        76.5339542...,  77.6647421...,  78.7406907...,  79.7741932...,
        80.7715767...,  81.73     ...,  82.6407518...,  83.507872 ...,
        84.3326333...,  85.109696 ...,  85.8292968...,  86.47944  ...,
        87.0480863...,  87.525344 ...,  87.9056578...,  88.19     ...,
        88.3858347...,  88.4975634...,  88.5258906...,  88.4696570...,
        88.3266460...,  88.0943906...,  87.7709802...,  87.3558672...,
        86.8506741...,  86.26     ...,  85.5911699...,  84.8503430...,
        84.0434801...,  83.1771110...,  82.2583874...,  81.2951360...,
        80.2959122...,  79.2700525...,  78.2277286...,  77.18     ...,
        77.18     ...,  77.18     ...,  77.18     ...,  77.18     ...])

clone()[source]

Clones the spectral power distribution.

Most of the SpectralPowerDistribution class operations are conducted in-place. The SpectralPowerDistribution.clone() method provides a convenient way to copy the spectral power distribution to a new object.

Returns:	Cloned spectral power distribution.
Return type:	SpectralPowerDistribution

Examples

>>> data = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> print(spd)  
SpectralPowerDistribution('Sample', (510..., 540..., 10...))
>>> spd_clone = spd.clone()
>>> print(spd_clone)  
SpectralPowerDistribution('Sample (...)', (510..., 540..., 10...))

data

Property for self._data private attribute.

Returns:	self._data.
Return type:	SpectralMapping

extrapolate(shape, method=u'Constant', left=None, right=None)[source]

Extrapolates the spectral power distribution following CIE 15:2004 recommendation.

Parameters:	shape (SpectralShape) – Spectral shape used for extrapolation. method (unicode, optional) – {‘Constant’, ‘Linear’},, Extrapolation method. left (numeric, optional) – Value to return for low extrapolation range. right (numeric, optional) – Value to return for high extrapolation range.
Returns:	Extrapolated spectral power distribution.
Return type:	SpectralPowerDistribution

See also

SpectralPowerDistribution.align()

References

[2]	CIE TC 1-48. (2004). Extrapolation. In CIE 015:2004 Colorimetry, 3rd Edition (p. 24). ISBN:978-3-901-90633-6

[3]	CIE TC 1-38. (2005). EXTRAPOLATION. In CIE 167:2005 Recommended Practice for Tabulating Spectral Data for Use in Colour Computations (pp. 19–20). ISBN:978-3-901-90641-1

Examples

>>> data = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> spd.extrapolate(  
...     SpectralShape(400, 700)).shape
SpectralShape(400..., 700..., 10...)
>>> spd[400]  
array(49.67...)
>>> spd[700]  
array(88.1...)

get(wavelength, default=nan)[source]

Returns the value for given wavelength $\lambda$.

Parameters:	wavelength (numeric or ndarray) – Wavelength $\lambda$ to retrieve the value. default (nan or numeric, optional) – Wavelength $\lambda$ default value.
Returns:	Wavelength $\lambda$ value.
Return type:	numeric or ndarray

Examples

>>> data = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> # Doctests ellipsis for Python 2.x compatibility.
>>> spd.get(510)  
array(49.67...)
>>> spd.get(511)
array(nan)
>>> spd.get(np.array([510, 520]))
array([ 49.67,  69.59])

interpolate(shape=SpectralShape(None, None, None), method=None)[source]

Interpolates the spectral power distribution following CIE 167:2005 recommendations: the method developed by Sprague (1880) should be used for interpolating functions having a uniformly spaced independent variable and a Cubic Spline method for non-uniformly spaced independent variable.

Parameters:	shape (SpectralShape, optional) – Spectral shape used for interpolation. method (unicode, optional) – {None, ‘Cubic Spline’, ‘Linear’, ‘Pchip’, ‘Sprague’}, Enforce given interpolation method.
Returns:	Interpolated spectral power distribution.
Return type:	SpectralPowerDistribution
Raises:	`RuntimeError` – If Sprague (1880) interpolation method is forced with a non-uniformly spaced independent variable. `ValueError` – If the interpolation method is not defined.

See also

SpectralPowerDistribution.align()

Notes

Interpolation will be conducted over boundaries range, if you need to extend the range of the spectral power distribution use the SpectralPowerDistribution.extrapolate() or SpectralPowerDistribution.align() methods.
Sprague (1880) interpolator cannot be used for interpolating functions having a non-uniformly spaced independent variable.

Warning

If scipy is not unavailable the Cubic Spline method will fallback to legacy Linear interpolation.
Cubic Spline interpolator requires at least 3 wavelengths $\lambda_n$ for interpolation.
Linear interpolator requires at least 2 wavelengths $\lambda_n$ for interpolation.
Pchip interpolator requires at least 2 wavelengths $\lambda_n$ for interpolation.
Sprague (1880) interpolator requires at least 6 wavelengths $\lambda_n$ for interpolation.

References

[4]	CIE TC 1-38. (2005). 9. INTERPOLATION. In CIE 167:2005 Recommended Practice for Tabulating Spectral Data for Use in Colour Computations (pp. 14–19). ISBN:978-3-901-90641-1

Examples

Uniform data is using Sprague (1880) interpolation by default:

>>> data = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 86.26,
...     560: 77.18}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> print(spd.interpolate(SpectralShape(interval=1)))
SpectralPowerDistribution('Sample', (510.0, 560.0, 1.0))
>>> spd[515]  
array(60.3121800...)

Non uniform data is using Cubic Spline interpolation by default:

>>> spd = SpectralPowerDistribution('Sample', data)
>>> spd[511] = 31.41
>>> print(spd.interpolate(SpectralShape(interval=1)))
SpectralPowerDistribution('Sample', (510.0, 560.0, 1.0))
>>> spd[515]  
array(21.4792222...)

Enforcing Linear interpolation:

>>> spd = SpectralPowerDistribution('Sample', data)
>>> print(spd.interpolate(
...     SpectralShape(interval=1), method='Linear'))
SpectralPowerDistribution('Sample', (510.0, 560.0, 1.0))
>>> spd[515]  
array(59.63...)

Enforcing Pchip interpolation:

>>> spd = SpectralPowerDistribution('Sample', data)
>>> print(spd.interpolate(
...     SpectralShape(interval=1), method='Pchip'))
SpectralPowerDistribution('Sample', (510.0, 560.0, 1.0))
>>> spd[515]  
array(60.7204982...)

is_uniform()[source]

Returns if the spectral power distribution has uniformly spaced data.

Returns:	Is uniform.
Return type:	bool

See also

SpectralPowerDistribution.shape()

Examples

>>> data = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> spd.is_uniform()
True

Breaking the interval by introducing a new wavelength $\lambda$ value:

>>> spd[511] = 3.1415
>>> spd.is_uniform()
False

items

Property for self.items attribute. This is a convenient attribute used to iterate over the spectral power distribution.

Returns:	Spectral power distribution data.
Return type:	ndarray

name

Property for self._name private attribute.

Returns:	self._name.
Return type:	unicode

normalise(factor=1)[source]

Normalises the spectral power distribution with given normalization factor.

Parameters:	factor (numeric, optional) – Normalization factor
Returns:	Normalised spectral power distribution.
Return type:	SpectralPowerDistribution

Examples

>>> data = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> print(spd.normalise())  
SpectralPowerDistribution('Sample', (510..., 540..., 10...))
>>> spd.values  
array([ 0.5632157...,  0.7890917...,  0.9267490...,  1.        ])

shape

Property for self.shape attribute.

Returns the shape of the spectral power distribution in the form of a SpectralShape class instance.

Returns:	Spectral power distribution shape.
Return type:	SpectralShape

See also

SpectralPowerDistribution.is_uniform

Notes

A non uniform spectral power distribution may will have multiple different interval, in that case SpectralPowerDistribution.shape returns the minimum interval size.

Warning

SpectralPowerDistribution.shape is read only.

Examples

Uniform spectral power distribution:

>>> data = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> SpectralPowerDistribution(  
...     'Sample', data).shape
SpectralShape(510..., 540..., 10...)

Non uniform spectral power distribution:

>>> data = {512.3: 49.67, 524.5: 69.59, 532.4: 81.73, 545.7: 88.19}
>>> # Doctests ellipsis for Python 2.x compatibility.
>>> SpectralPowerDistribution(  
...     'Sample', data).shape
SpectralShape(512.3, 545.7, 7...)

title

Property for self._title private attribute.

Returns:	self._title.
Return type:	unicode

trim_wavelengths(shape)[source]

Trims the spectral power distribution wavelengths to given spectral shape.

Parameters:	shape (SpectralShape) – Spectral shape used for trimming.
Returns:	Trimed spectral power distribution.
Return type:	SpectralPowerDistribution

Examples

>>> data = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 86.26,
...     560: 77.18}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> print(spd.trim_wavelengths(  
...     SpectralShape(520, 550, 10)))
SpectralPowerDistribution('Sample', (520.0, 550.0, 10.0))
>>> # Doctests skip for Python 2.x compatibility.
>>> spd.wavelengths  
array([ 520.,  530.,  540.,  550.])

values

Property for self.values attribute.

Returns:	Spectral power distribution wavelengths $\lambda_n$ values.
Return type:	ndarray

Warning

SpectralPowerDistribution.values is read only.

wavelengths

Property for self.wavelengths attribute.

Returns:	Spectral power distribution wavelengths $\lambda_n$.
Return type:	ndarray

Warning

SpectralPowerDistribution.wavelengths is read only.

zeros(shape=SpectralShape(None, None, None))[source]

Zeros fills the spectral power distribution: Missing values will be replaced with zeros to fit the defined range.

Parameters:	shape (SpectralShape, optional) – Spectral shape used for zeros fill.
Returns:	Zeros filled spectral power distribution.
Return type:	SpectralPowerDistribution
Raises:	`RuntimeError` – If the spectral power distribution cannot be zeros filled.

Examples

>>> data = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 86.26,
...     560: 77.18}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> print(spd.zeros(SpectralShape(505, 565, 1)))
SpectralPowerDistribution('Sample', (505.0, 565.0, 1.0))
>>> spd.values
array([  0.  ,   0.  ,   0.  ,   0.  ,   0.  ,  49.67,   0.  ,   0.  ,
         0.  ,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,  69.59,
         0.  ,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,
         0.  ,  81.73,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,
         0.  ,   0.  ,   0.  ,  88.19,   0.  ,   0.  ,   0.  ,   0.  ,
         0.  ,   0.  ,   0.  ,   0.  ,   0.  ,  86.26,   0.  ,   0.  ,
         0.  ,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,   0.  ,  77.18,
         0.  ,   0.  ,   0.  ,   0.  ,   0.  ])

class colour.colorimetry.TriSpectralPowerDistribution(name, data, mapping, title=None, labels=None)[source]¶

Bases: object

Defines the base object for colour matching functions.

A compound of three SpectralPowerDistribution is used to store the underlying axis data.

Parameters:	name (unicode) – Tri-spectral power distribution name. data (dict) – Tri-spectral power distribution data. mapping (dict) – Tri-spectral power distribution attributes mapping. title (unicode, optional) – Tri-spectral power distribution title for figures. labels (dict, optional) – Tri-spectral power distribution axis labels mapping for figures.

name¶

mapping¶

data¶

title¶

labels¶

x¶

y¶

z¶

wavelengths¶

values¶

items¶

shape¶

__str__()[source]¶

__repr__()[source]¶

__hash__()[source]¶

__init__()[source]¶

__getitem__()[source]¶

__setitem__()[source]¶

__iter__()[source]¶

__contains__()[source]¶

__len__()[source]¶

__eq__()[source]¶

__ne__()[source]¶

__add__()[source]¶

__iadd__()[source]¶

__sub__()[source]¶

__isub__()[source]¶

__mul__()[source]¶

__imul__()[source]¶

__div__()[source]¶

__idiv__()[source]¶

__pow__()[source]¶

__ipow__()[source]¶

get()[source]¶

is_uniform()[source]¶

extrapolate()[source]¶

interpolate()[source]¶

align()[source]¶

trim_wavelengths()[source]¶

zeros()[source]¶

normalise()[source]¶

clone()[source]¶

Examples

>>> x_bar = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> y_bar = {510: 90.56, 520: 87.34, 530: 45.76, 540: 23.45}
>>> z_bar = {510: 12.43, 520: 23.15, 530: 67.98, 540: 90.28}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> # Doctests skip for Python 2.x compatibility.
>>> tri_spd.wavelengths  
array([510, 520, 530, 540])
>>> tri_spd.values
array([[ 49.67,  90.56,  12.43],
       [ 69.59,  87.34,  23.15],
       [ 81.73,  45.76,  67.98],
       [ 88.19,  23.45,  90.28]])
>>> # Doctests skip for Python 2.x compatibility.
>>> tri_spd.shape  
SpectralShape(510, 540, 10)

align(shape, interpolation_method=None, extrapolation_method=u'Constant', extrapolation_left=None, extrapolation_right=None)[source]

Aligns the tri-spectral power distribution to given shape: Interpolates first then extrapolates to fit the given range.

Parameters:	shape (SpectralShape) – Spectral shape used for alignment. interpolation_method (unicode, optional) – {None, ‘Cubic Spline’, ‘Linear’, ‘Pchip’, ‘Sprague’}, Enforce given interpolation method. extrapolation_method (unicode, optional) – {‘Constant’, ‘Linear’}, Extrapolation method. extrapolation_left (numeric, optional) – Value to return for low extrapolation range. extrapolation_right (numeric, optional) – Value to return for high extrapolation range.
Returns:	Aligned tri-spectral power distribution.
Return type:	TriSpectralPowerDistribution

Examples

>>> x_bar = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 89.76,
...     560: 90.28}
>>> y_bar = {
...     510: 90.56,
...     520: 87.34,
...     530: 45.76,
...     540: 23.45,
...     550: 15.34,
...     560: 10.11}
>>> z_bar = {
...     510: 12.43,
...     520: 23.15,
...     530: 67.98,
...     540: 90.28,
...     550: 91.61,
...     560: 98.24}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> print(tri_spd.align(SpectralShape(505, 565, 1)))
TriSpectralPowerDistribution('Observer', (505.0, 565.0, 1.0))
>>> # Doctests skip for Python 2.x compatibility.
>>> tri_spd.wavelengths  
array([505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517,
       518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530,
       531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543,
       544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556,
       557, 558, 559, 560, 561, 562, 563, 564, 565])
>>> tri_spd.values  
array([[ 49.67     ...,  90.56     ...,  12.43     ...],
       [ 49.67     ...,  90.56     ...,  12.43     ...],
       [ 49.67     ...,  90.56     ...,  12.43     ...],
       [ 49.67     ...,  90.56     ...,  12.43     ...],
       [ 49.67     ...,  90.56     ...,  12.43     ...],
       [ 49.67     ...,  90.56     ...,  12.43     ...],
       [ 51.8325938...,  91.2994928...,  12.5377184...],
       [ 53.9841952...,  91.9502387...,  12.7233193...],
       [ 56.1205452...,  92.5395463...,  12.9651679...],
       [ 58.2315395...,  93.0150037...,  13.3123777...],
       [ 60.3033208...,  93.2716331...,  13.8605136...],
       [ 62.3203719...,  93.1790455...,  14.7272944...],
       [ 64.2676077...,  92.6085951...,  16.0282961...],
       [ 66.1324679...,  91.4605335...,  17.8526544...],
       [ 67.9070097...,  89.6911649...,  20.2387677...],
       [ 69.59     ...,  87.34     ...,  23.15     ...],
       [ 71.1837378...,  84.4868033...,  26.5150469...],
       [ 72.6800056...,  81.0666018...,  30.3964852...],
       [ 74.0753483...,  77.0766254...,  34.7958422...],
       [ 75.3740343...,  72.6153870...,  39.6178858...],
       [ 76.5856008...,  67.8490714...,  44.7026805...],
       [ 77.7223995...,  62.9779261...,  49.8576432...],
       [ 78.7971418...,  58.2026503...,  54.8895997...],
       [ 79.8204447...,  53.6907852...,  59.6368406...],
       [ 80.798376 ...,  49.5431036...,  64.0011777...],
       [ 81.73     ...,  45.76     ...,  67.98     ...],
       [ 82.6093606...,  42.2678534...,  71.6460893...],
       [ 83.439232 ...,  39.10608  ...,  74.976976 ...],
       [ 84.2220071...,  36.3063728...,  77.9450589...],
       [ 84.956896 ...,  33.85464  ...,  80.552    ...],
       [ 85.6410156...,  31.7051171...,  82.8203515...],
       [ 86.27048  ...,  29.79448  ...,  84.785184 ...],
       [ 86.8414901...,  28.0559565...,  86.4857131...],
       [ 87.351424 ...,  26.43344  ...,  87.956928 ...],
       [ 87.7999266...,  24.8956009...,  89.2212178...],
       [ 88.19     ...,  23.45     ...,  90.28     ...],
       [ 88.5265036...,  22.1424091...,  91.1039133...],
       [ 88.8090803...,  20.9945234...,  91.6538035...],
       [ 89.0393279...,  20.0021787...,  91.9333499...],
       [ 89.2222817...,  19.1473370...,  91.9858818...],
       [ 89.3652954...,  18.4028179...,  91.8811002...],
       [ 89.4769231...,  17.7370306...,  91.7018000...],
       [ 89.5657996...,  17.1187058...,  91.5305910...],
       [ 89.6395227...,  16.5216272...,  91.4366204...],
       [ 89.7035339...,  15.9293635...,  91.4622944...],
       [ 89.76     ...,  15.34     ...,  91.61     ...],
       [ 89.8094041...,  14.7659177...,  91.8528616...],
       [ 89.8578890...,  14.2129190...,  92.2091737...],
       [ 89.9096307...,  13.6795969...,  92.6929664...],
       [ 89.9652970...,  13.1613510...,  93.2988377...],
       [ 90.0232498...,  12.6519811...,  94.0078786...],
       [ 90.0807467...,  12.1452800...,  94.7935995...],
       [ 90.1351435...,  11.6366269...,  95.6278555...],
       [ 90.1850956...,  11.1245805...,  96.4867724...],
       [ 90.2317606...,  10.6124724...,  97.3566724...],
       [ 90.28     ...,  10.11     ...,  98.24     ...],
       [ 90.28     ...,  10.11     ...,  98.24     ...],
       [ 90.28     ...,  10.11     ...,  98.24     ...],
       [ 90.28     ...,  10.11     ...,  98.24     ...],
       [ 90.28     ...,  10.11     ...,  98.24     ...],
       [ 90.28     ...,  10.11     ...,  98.24     ...]])

clone()[source]

Clones the tri-spectral power distribution.

Most of the TriSpectralPowerDistribution class operations are conducted in-place. The TriSpectralPowerDistribution.clone() method provides a convenient way to copy the tri-spectral power distribution to a new object.

Returns:	Cloned tri-spectral power distribution.
Return type:	TriSpectralPowerDistribution

Examples

>>> x_bar = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 89.76,
...     560: 90.28}
>>> y_bar = {
...     510: 90.56,
...     520: 87.34,
...     530: 45.76,
...     540: 23.45,
...     550: 15.34,
...     560: 10.11}
>>> z_bar = {
...     510: 12.43,
...     520: 23.15,
...     530: 67.98,
...     540: 90.28,
...     550: 91.61,
...     560: 98.24}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> print(tri_spd)  
TriSpectralPowerDistribution('Observer', (510..., 560..., 10...))
>>> tri_spd_clone = tri_spd.clone()
>>> print(tri_spd_clone)  
TriSpectralPowerDistribution('Observer (...)', (510..., 560..., 10...))

data

Property for self._data private attribute.

Returns:	self._data.
Return type:	dict

extrapolate(shape, method=u'Constant', left=None, right=None)[source]

Extrapolates the tri-spectral power distribution following CIE 15:2004 recommendation. [2]_ [3]_

Parameters:	shape (SpectralShape) – Spectral shape used for extrapolation. method (unicode, optional) – {‘Constant’, ‘Linear’}, Extrapolation method. left (numeric, optional) – Value to return for low extrapolation range. right (numeric, optional) – Value to return for high extrapolation range.
Returns:	Extrapolated tri-spectral power distribution.
Return type:	TriSpectralPowerDistribution

See also

TriSpectralPowerDistribution.align()

Examples

>>> x_bar = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> y_bar = {510: 90.56, 520: 87.34, 530: 45.76, 540: 23.45}
>>> z_bar = {510: 12.43, 520: 23.15, 530: 67.98, 540: 90.28}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> tri_spd.extrapolate(  
...     SpectralShape(400, 700)).shape
SpectralShape(400..., 700..., 10...)
>>> tri_spd[400]
array([ 49.67,  90.56,  12.43])
>>> tri_spd[700]
array([ 88.19,  23.45,  90.28])

get(wavelength, default=nan)[source]

Returns the values for given wavelength $\lambda$.

Parameters:	wavelength (numeric or array_like) – Wavelength $\lambda$ to retrieve the values. default (nan, numeric or array_like, optional) – Wavelength $\lambda$ default values.
Returns:	Wavelength $\lambda$ values.
Return type:	numeric or array_like

Examples

>>> x_bar = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> y_bar = {510: 90.56, 520: 87.34, 530: 45.76, 540: 23.45}
>>> z_bar = {510: 12.43, 520: 23.15, 530: 67.98, 540: 90.28}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> tri_spd.get(510)
array([ 49.67,  90.56,  12.43])
>>> tri_spd.get(np.array([510, 520]))
array([[ 49.67,  90.56,  12.43],
       [ 69.59,  87.34,  23.15]])
>>> tri_spd.get(511)
array([ nan,  nan,  nan])
>>> tri_spd.get(np.array([510, 520]))
array([[ 49.67,  90.56,  12.43],
       [ 69.59,  87.34,  23.15]])

interpolate(shape=SpectralShape(None, None, None), method=None)[source]

Interpolates the tri-spectral power distribution following CIE 167:2005 recommendations: the method developed by Sprague (1880) should be used for interpolating functions having a uniformly spaced independent variable and a Cubic Spline method for non-uniformly spaced independent variable. [4]_

Parameters:	shape (SpectralShape, optional) – Spectral shape used for interpolation. method (unicode, optional) – {None, ‘Cubic Spline’, ‘Linear’, ‘Pchip’, ‘Sprague’}, Enforce given interpolation method.
Returns:	Interpolated tri-spectral power distribution.
Return type:	TriSpectralPowerDistribution

See also

TriSpectralPowerDistribution.align()

Notes

See SpectralPowerDistribution.interpolate() method notes section.

Warning

See SpectralPowerDistribution.interpolate() method warning section.

Examples

Uniform data is using Sprague (1880) interpolation by default:

>>> x_bar = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 89.76,
...     560: 90.28}
>>> y_bar = {
...     510: 90.56,
...     520: 87.34,
...     530: 45.76,
...     540: 23.45,
...     550: 15.34,
...     560: 10.11}
>>> z_bar = {
...     510: 12.43,
...     520: 23.15,
...     530: 67.98,
...     540: 90.28,
...     550: 91.61,
...     560: 98.24}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> print(tri_spd.interpolate(SpectralShape(interval=1)))
TriSpectralPowerDistribution('Observer', (510.0, 560.0, 1.0))
>>> tri_spd[515]  
array([ 60.3033208...,  93.2716331...,  13.8605136...])

Non uniform data is using Cubic Spline interpolation by default:

>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> tri_spd[511] = np.array([31.41, 95.27, 15.06])
>>> print(tri_spd.interpolate(SpectralShape(interval=1)))
TriSpectralPowerDistribution('Observer', (510.0, 560.0, 1.0))
>>> tri_spd[515]  
array([  21.4710405...,  100.6430015...,   18.8165196...])

Enforcing Linear interpolation:

>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> print(tri_spd.interpolate(  
...     SpectralShape(interval=1), method='Linear'))
TriSpectralPowerDistribution('Observer', (510.0, 560.0, 1.0))
>>> tri_spd[515]  
array([ 59.63...,  88.95...,  17.79...])

Enforcing Pchip interpolation:

>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> print(tri_spd.interpolate(  
...     SpectralShape(interval=1), method='Pchip'))
TriSpectralPowerDistribution('Observer', (510.0, 560.0, 1.0))
>>> tri_spd[515]  
array([ 60.7204982...,  89.6971406...,  15.6271845...])

is_uniform()[source]

Returns if the tri-spectral power distribution has uniformly spaced data.

Returns:	Is uniform.
Return type:	bool

See also

TriSpectralPowerDistribution.shape()

Examples

>>> x_bar = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> y_bar = {510: 90.56, 520: 87.34, 530: 45.76, 540: 23.45}
>>> z_bar = {510: 12.43, 520: 23.15, 530: 67.98, 540: 90.28}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> tri_spd.is_uniform()
True

Breaking the interval by introducing new wavelength $\lambda$ values:

>>> tri_spd[511] = np.array([49.6700, 49.6700, 49.6700])
>>> tri_spd.is_uniform()
False

items

Property for self.items attribute. This is a convenient attribute used to iterate over the tri-spectral power distribution.

Returns:	Tri-spectral power distribution data.
Return type:	ndarray

labels

Property for self._labels private attribute.

Returns:	self._labels.
Return type:	dict

mapping

Property for self._mapping private attribute.

Returns:	self._mapping.
Return type:	dict

name

Property for self._name private attribute.

Returns:	self._name.
Return type:	unicode

normalise(factor=1)[source]

Normalises the tri-spectral power distribution with given normalization factor.

Parameters:	factor (numeric, optional) – Normalization factor
Returns:	Normalised tri- spectral power distribution.
Return type:	TriSpectralPowerDistribution

Notes

The implementation uses the maximum value for all axis.

Examples

>>> x_bar = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 89.76,
...     560: 90.28}
>>> y_bar = {
...     510: 90.56,
...     520: 87.34,
...     530: 45.76,
...     540: 23.45,
...     550: 15.34,
...     560: 10.11}
>>> z_bar = {
...     510: 12.43,
...     520: 23.15,
...     530: 67.98,
...     540: 90.28,
...     550: 91.61,
...     560: 98.24}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> print(tri_spd.normalise())  
TriSpectralPowerDistribution('Observer', (510..., 560..., 10...))
>>> tri_spd.values  
array([[ 0.5055985...,  0.9218241...,  0.1265268...],
       [ 0.7083672...,  0.8890472...,  0.2356473...],
       [ 0.8319421...,  0.4657980...,  0.6919788...],
       [ 0.8976995...,  0.2387011...,  0.9189739...],
       [ 0.9136807...,  0.1561482...,  0.9325122...],
       [ 0.9189739...,  0.1029112...,  1.       ...]])

shape

Property for self.shape attribute.

Returns the shape of the tri-spectral power distribution in the form of a SpectralShape class instance.

Returns:	Tri-spectral power distribution shape.
Return type:	SpectralShape

Warning

TriSpectralPowerDistribution.shape is read only.

Examples

>>> x_bar = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> y_bar = {510: 90.56, 520: 87.34, 530: 45.76, 540: 23.45}
>>> z_bar = {510: 12.43, 520: 23.15, 530: 67.98, 540: 90.28}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> tri_spd.shape  
SpectralShape(510..., 540..., 10...)

title

Property for self._title private attribute.

Returns:	self._title.
Return type:	unicode

trim_wavelengths(shape)[source]

Trims the tri-spectral power distribution wavelengths to given shape.

Parameters:	shape (SpectralShape) – Spectral shape used for trimming.
Returns:	Trimmed tri-spectral power distribution.
Return type:	TriSpectralPowerDistribution

Examples

>>> x_bar = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 89.76,
...     560: 90.28}
>>> y_bar = {
...     510: 90.56,
...     520: 87.34,
...     530: 45.76,
...     540: 23.45,
...     550: 15.34,
...     560: 10.11}
>>> z_bar = {
...     510: 12.43,
...     520: 23.15,
...     530: 67.98,
...     540: 90.28,
...     550: 91.61,
...     560: 98.24}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> # Doctests skip for Python 2.x compatibility.
>>> print(tri_spd.trim_wavelengths(  
...     SpectralShape(520, 550, 10)))
TriSpectralPowerDistribution('Observer', (520.0, 550.0, 10.0))
>>> tri_spd.wavelengths  
array([ 520.,  530.,  540.,  550.])

values

Property for self.values attribute.

Returns:	Tri-spectral power distribution wavelengths $\lambda_n$ values.
Return type:	ndarray

Warning

TriSpectralPowerDistribution.values is read only.

wavelengths

Property for self.wavelengths attribute.

Returns:	Tri-spectral power distribution wavelengths $\lambda_n$.
Return type:	ndarray

Warning

TriSpectralPowerDistribution.wavelengths is read only.

x

Property for self.x attribute.

Returns:	Spectral power distribution for x axis.
Return type:	SpectralPowerDistribution

Warning

TriSpectralPowerDistribution.x is read only.

y

Property for self.y attribute.

Returns:	Spectral power distribution for y axis.
Return type:	SpectralPowerDistribution

Warning

TriSpectralPowerDistribution.y is read only.

z

Property for self.z attribute.

Returns:	Spectral power distribution for z axis.
Return type:	SpectralPowerDistribution

Warning

TriSpectralPowerDistribution.z is read only.

zeros(shape=SpectralShape(None, None, None))[source]

Zeros fills the tri-spectral power distribution: Missing values will be replaced with zeros to fit the defined range.

Parameters:	shape (SpectralShape, optional) – Spectral shape used for zeros fill.
Returns:	Zeros filled tri-spectral power distribution.
Return type:	TriSpectralPowerDistribution

Examples

>>> x_bar = {
...     510: 49.67,
...     520: 69.59,
...     530: 81.73,
...     540: 88.19,
...     550: 89.76,
...     560: 90.28}
>>> y_bar = {
...     510: 90.56,
...     520: 87.34,
...     530: 45.76,
...     540: 23.45,
...     550: 15.34,
...     560: 10.11}
>>> z_bar = {
...     510: 12.43,
...     520: 23.15,
...     530: 67.98,
...     540: 90.28,
...     550: 91.61,
...     560: 98.24}
>>> data = {'x_bar': x_bar, 'y_bar': y_bar, 'z_bar': z_bar}
>>> mapping = {'x': 'x_bar', 'y': 'y_bar', 'z': 'z_bar'}
>>> tri_spd = TriSpectralPowerDistribution('Observer', data, mapping)
>>> print(tri_spd.zeros(SpectralShape(505, 565, 1)))
TriSpectralPowerDistribution('Observer', (505.0, 565.0, 1.0))
>>> tri_spd.values
array([[  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [ 49.67,  90.56,  12.43],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [ 69.59,  87.34,  23.15],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [ 81.73,  45.76,  67.98],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [ 88.19,  23.45,  90.28],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [ 89.76,  15.34,  91.61],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [ 90.28,  10.11,  98.24],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ],
       [  0.  ,   0.  ,   0.  ]])

colour.colorimetry.constant_spd(k, shape=SpectralShape(360.0, 780.0, 1.0))[source]¶

Returns a spectral power distribution of given spectral shape filled with constant $k$ values.

Parameters:	k (numeric) – Constant $k$ to fill the spectral power distribution with. shape (SpectralShape, optional) – Spectral shape used to create the spectral power distribution.
Returns:	Constant $k$ to filled spectral power distribution.
Return type:	SpectralPowerDistribution

Notes

By default, the spectral power distribution will use the shape given by DEFAULT_SPECTRAL_SHAPE attribute.

Examples

>>> spd = constant_spd(100)
>>> spd.shape
SpectralShape(360.0, 780.0, 1.0)
>>> spd[400]
array(100.0)

colour.colorimetry.zeros_spd(shape=SpectralShape(360.0, 780.0, 1.0))[source]¶

Returns a spectral power distribution of given spectral shape filled with zeros.

Parameters:	shape (SpectralShape, optional) – Spectral shape used to create the spectral power distribution.
Returns:	Zeros filled spectral power distribution.
Return type:	SpectralPowerDistribution

See also

constant_spd()

Notes

By default, the spectral power distribution will use the shape given by DEFAULT_SPECTRAL_SHAPE attribute.

Examples

>>> spd = zeros_spd()
>>> spd.shape
SpectralShape(360.0, 780.0, 1.0)
>>> spd[400]
array(0.0)

colour.colorimetry.ones_spd(shape=SpectralShape(360.0, 780.0, 1.0))[source]¶

Returns a spectral power distribution of given spectral shape filled with ones.

Parameters:	shape (SpectralShape, optional) – Spectral shape used to create the spectral power distribution.
Returns:	Ones filled spectral power distribution.
Return type:	SpectralPowerDistribution

See also

constant_spd()

Notes

By default, the spectral power distribution will use the shape given by DEFAULT_SPECTRAL_SHAPE attribute.

Examples

>>> spd = ones_spd()
>>> spd.shape
SpectralShape(360.0, 780.0, 1.0)
>>> spd[400]
array(1.0)

colour.colorimetry.blackbody_spd(temperature, shape=SpectralShape(360.0, 780.0, 1.0), c1=3.741771e-16, c2=0.014388, n=1)[source]¶

Returns the spectral power distribution of the planckian radiator for given temperature $T[K]$.

Parameters:	temperature (numeric) – Temperature $T[K]$ in kelvin degrees. shape (SpectralShape, optional) – Spectral shape used to create the spectral power distribution of the planckian radiator. c1 (numeric, optional) – The official value of $c1$ is provided by the Committee on Data for Science and Technology (CODATA) and is $c1=3,741771x10.16\ W/m_2$ (Mohr and Taylor, 2000). c2 (numeric, optional) – Since $T$ is measured on the International Temperature Scale, the value of $c2$ used in colorimetry should follow that adopted in the current International Temperature Scale (ITS-90) (Preston-Thomas, 1990; Mielenz et aI., 1991), namely $c2=1,4388x10.2\ m/K$. n (numeric, optional) – Medium index of refraction. For dry air at 15°C and 101 325 Pa, containing 0,03 percent by volume of carbon dioxide, it is approximately 1,00028 throughout the visible region although CIE 15:2004 recommends using $n=1$.
Returns:	Blackbody spectral power distribution.
Return type:	SpectralPowerDistribution

Examples

>>> from colour import STANDARD_OBSERVERS_CMFS
>>> cmfs = STANDARD_OBSERVERS_CMFS['CIE 1931 2 Degree Standard Observer']
>>> print(blackbody_spd(5000, cmfs.shape))
SpectralPowerDistribution('5000K Blackbody', (360.0, 830.0, 1.0))

colour.colorimetry.blackbody_spectral_radiance(wavelength, temperature, c1=3.741771e-16, c2=0.014388, n=1)¶

Returns the spectral radiance of a blackbody at thermodynamic temperature $T[K]$ in a medium having index of refraction $n$.

Parameters:	wavelength (numeric or array_like) – Wavelength in meters. temperature (numeric or array_like) – Temperature $T[K]$ in kelvin degrees. c1 (numeric or array_like, optional) – The official value of $c1$ is provided by the Committee on Data for Science and Technology (CODATA) and is $c1=3,741771x10.16\ W/m_2$ (Mohr and Taylor, 2000). c2 (numeric or array_like, optional) – Since $T$ is measured on the International Temperature Scale, the value of $c2$ used in colorimetry should follow that adopted in the current International Temperature Scale (ITS-90) (Preston-Thomas, 1990; Mielenz et aI., 1991), namely $c2=1,4388x10.2\ m/K$. n (numeric or array_like, optional) – Medium index of refraction. For dry air at 15°C and 101 325 Pa, containing 0,03 percent by volume of carbon dioxide, it is approximately 1,00028 throughout the visible region although CIE 15:2004 recommends using $n=1$.
Returns:	Radiance in watts per steradian per square metre.
Return type:	numeric or ndarray

Notes

The following form implementation is expressed in term of wavelength.
The SI unit of radiance is watts per steradian per square metre.

References

[1]	CIE TC 1-48. (2004). APPENDIX E. INFORMATION ON THE USE OF PLANCK’S EQUATION FOR STANDARD AIR. In CIE 015:2004 Colorimetry, 3rd Edition (pp. 77–82). ISBN:978-3-901-90633-6

Examples

>>> # Doctests ellipsis for Python 2.x compatibility.
>>> planck_law(500 * 1e-9, 5500)  
20472701909806.5...

colour.colorimetry.planck_law(wavelength, temperature, c1=3.741771e-16, c2=0.014388, n=1)[source]¶

Returns the spectral radiance of a blackbody at thermodynamic temperature $T[K]$ in a medium having index of refraction $n$.

Parameters:	wavelength (numeric or array_like) – Wavelength in meters. temperature (numeric or array_like) – Temperature $T[K]$ in kelvin degrees. c1 (numeric or array_like, optional) – The official value of $c1$ is provided by the Committee on Data for Science and Technology (CODATA) and is $c1=3,741771x10.16\ W/m_2$ (Mohr and Taylor, 2000). c2 (numeric or array_like, optional) – Since $T$ is measured on the International Temperature Scale, the value of $c2$ used in colorimetry should follow that adopted in the current International Temperature Scale (ITS-90) (Preston-Thomas, 1990; Mielenz et aI., 1991), namely $c2=1,4388x10.2\ m/K$. n (numeric or array_like, optional) – Medium index of refraction. For dry air at 15°C and 101 325 Pa, containing 0,03 percent by volume of carbon dioxide, it is approximately 1,00028 throughout the visible region although CIE 15:2004 recommends using $n=1$.
Returns:	Radiance in watts per steradian per square metre.
Return type:	numeric or ndarray

Notes

The following form implementation is expressed in term of wavelength.
The SI unit of radiance is watts per steradian per square metre.

References

[1]	CIE TC 1-48. (2004). APPENDIX E. INFORMATION ON THE USE OF PLANCK’S EQUATION FOR STANDARD AIR. In CIE 015:2004 Colorimetry, 3rd Edition (pp. 77–82). ISBN:978-3-901-90633-6

Examples

>>> # Doctests ellipsis for Python 2.x compatibility.
>>> planck_law(500 * 1e-9, 5500)  
20472701909806.5...

class colour.colorimetry.LMS_ConeFundamentals(name, data, title=None)[source]¶

Bases: colour.colorimetry.spectrum.TriSpectralPowerDistribution

Implements support for the Stockman and Sharpe LMS cone fundamentals colour matching functions.

Parameters:	name (unicode) – LMS colour matching functions name. data (dict) – LMS colour matching functions. title (unicode, optional) – LMS colour matching functions title for figures.

l_bar¶

m_bar¶

s_bar¶

l_bar

Property for self.x attribute.

Returns:	self.x
Return type:	SpectralPowerDistribution

Warning

LMS_ConeFundamentals.l_bar is read only.

m_bar

Property for self.y attribute.

Returns:	self.y
Return type:	SpectralPowerDistribution

Warning

LMS_ConeFundamentals.m_bar is read only.

s_bar

Property for self.z attribute.

Returns:	self.z
Return type:	SpectralPowerDistribution

Warning

LMS_ConeFundamentals.s_bar is read only.

class colour.colorimetry.RGB_ColourMatchingFunctions(name, data, title=None)[source]¶

Bases: colour.colorimetry.spectrum.TriSpectralPowerDistribution

Implements support for the CIE RGB colour matching functions.

Parameters:	name (unicode) – CIE RGB colour matching functions name. data (dict) – CIE RGB colour matching functions. title (unicode, optional) – CIE RGB colour matching functions title for figures.

r_bar¶

g_bar¶

b_bar¶

b_bar

Property for self.z attribute.

Returns:	self.z
Return type:	SpectralPowerDistribution

Warning

RGB_ColourMatchingFunctions.b_bar is read only.

g_bar

Property for self.y attribute.

Returns:	self.y
Return type:	SpectralPowerDistribution

Warning

RGB_ColourMatchingFunctions.g_bar is read only.

r_bar

Property for self.x attribute.

Returns:	self.x
Return type:	SpectralPowerDistribution

Warning

RGB_ColourMatchingFunctions.r_bar is read only.

class colour.colorimetry.XYZ_ColourMatchingFunctions(name, data, title=None)[source]¶

Bases: colour.colorimetry.spectrum.TriSpectralPowerDistribution

Implements support for the CIE Standard Observers XYZ colour matching functions.

Parameters:	name (unicode) – CIE Standard Observer XYZ colour matching functions name. data (dict) – CIE Standard Observer XYZ colour matching functions. title (unicode, optional) – CIE Standard Observer XYZ colour matching functions title for figures.

x_bar¶

y_bar¶

z_bar¶

x_bar

Property for self.x attribute.

Returns:	self.x
Return type:	SpectralPowerDistribution

Warning

XYZ_ColourMatchingFunctions.x_bar is read only.

y_bar

Property for self.y attribute.

Returns:	self.y
Return type:	SpectralPowerDistribution

Warning

XYZ_ColourMatchingFunctions.y_bar is read only.

z_bar

Property for self.z attribute.

Returns:	self.z
Return type:	SpectralPowerDistribution

Warning

XYZ_ColourMatchingFunctions.z_bar is read only.

colour.colorimetry.bandpass_correction(spd, method=u'Stearns 1988')[source]¶

Implements spectral bandpass dependence correction on given spectral power distribution using given method.

Parameters:	spd (SpectralPowerDistribution) – Spectral power distribution. method (unicode, optional) – (‘Stearns 1988’, ) Correction method.
Returns:	Spectral bandpass dependence corrected spectral power distribution.
Return type:	SpectralPowerDistribution

colour.colorimetry.bandpass_correction_Stearns1988(spd)[source]¶

Implements spectral bandpass dependence correction on given spectral power distribution using Stearns and Stearns (1988) method.

Parameters:	spd (SpectralPowerDistribution) – Spectral power distribution.
Returns:	Spectral bandpass dependence corrected spectral power distribution.
Return type:	SpectralPowerDistribution

References

[1]	Westland, S., Ripamonti, C., & Cheung, V. (2012). Correction for Spectral Bandpass. In Computational Colour Science Using MATLAB (2nd ed., p. 38). ISBN:978-0-470-66569-5

[2]	Stearns, E. I., & Stearns, R. E. (1988). An example of a method for correcting radiance data for Bandpass error. Color Research & Application, 13(4), 257–259. doi:10.1002/col.5080130410

Examples

>>> from colour import SpectralPowerDistribution
>>> data = {510: 49.67, 520: 69.59, 530: 81.73, 540: 88.19}
>>> spd = SpectralPowerDistribution('Spd', data)
>>> corrected_spd = bandpass_correction_Stearns1988(spd)
>>> corrected_spd.values  
array([ 48.01664   ,  70.3729688...,  82.0919506...,  88.72618   ])

colour.colorimetry.D_illuminant_relative_spd(xy)[source]¶

Returns the relative spectral power distribution of given CIE Standard Illuminant D Series using given xy chromaticity coordinates.

References

[1]	Wyszecki, G., & Stiles, W. S. (2000). CIE Method of Calculating D-Illuminants. In Color Science: Concepts and Methods, Quantitative Data and Formulae (pp. 145–146). Wiley. ISBN:978-0471399186

[2]	Lindbloom, B. (2007). Spectral Power Distribution of a CIE D-Illuminant. Retrieved April 05, 2014, from http://www.brucelindbloom.com/Eqn_DIlluminant.html

Parameters:	xy (array_like) – xy chromaticity coordinates.
Returns:	CIE Standard Illuminant D Series relative spectral power distribution.
Return type:	SpectralPowerDistribution

Examples

>>> xy = np.array([0.34570, 0.35850])
>>> print(D_illuminant_relative_spd(xy))
SpectralPowerDistribution('CIE Standard Illuminant D Series', (300.0, 830.0, 10.0))

colour.colorimetry.CIE_standard_illuminant_A_function(wl)[source]¶

CIE Standard Illuminant A is intended to represent typical, domestic, tungsten-filament lighting. Its relative spectral power distribution is that of a Planckian radiator at a temperature of approximately 2856 K. CIE Standard Illuminant A should be used in all applications of colorimetry involving the use of incandescent lighting, unless there are specific reasons for using a different illuminant.

Parameters:	wl (array_like) – Wavelength to evaluate the function at.
Returns:	CIE Standard Illuminant A value at given wavelength.
Return type:	ndarray

References

[1]	CIE TC 1-48. (2004). 3.1 Recommendations concerning standard physical data of illuminants. In CIE 015:2004 Colorimetry, 3rd Edition (pp. 12–13). ISBN:978-3-901-90633-6

Examples

>>> wl = np.array([560, 580, 581.5])
>>> CIE_standard_illuminant_A_function(wl)  
array([ 100.        ,  114.4363383...,  115.5285063...])

colour.colorimetry.mesopic_luminous_efficiency_function(Lp, source=u'Blue Heavy', method=u'MOVE', photopic_lef=SpectralPowerDistribution( 'CIE 1924 Photopic Standard Observer', {360.0: 3.917e-06, 361.0: 4.393581e-06, 362.0: 4.929604e-06, 363.0: 5.532136e-06, 364.0: 6.208245e-06, 365.0: 6.965e-06, 366.0: 7.813219e-06, 367.0: 8.767336e-06, 368.0: 9.839844e-06, 369.0: 1.104323e-05, 370.0: 1.239e-05, 371.0: 1.388641e-05, 372.0: 1.555728e-05, 373.0: 1.744296e-05, 374.0: 1.958375e-05, 375.0: 2.202e-05, 376.0: 2.483965e-05, 377.0: 2.804126e-05, 378.0: 3.153104e-05, 379.0: 3.521521e-05, 380.0: 3.9e-05, 381.0: 4.28264e-05, 382.0: 4.69146e-05, 383.0: 5.15896e-05, 384.0: 5.71764e-05, 385.0: 6.4e-05, 386.0: 7.234421e-05, 387.0: 8.221224e-05, 388.0: 9.350816e-05, 389.0: 0.0001061361, 390.0: 0.00012, 391.0: 0.000134984, 392.0: 0.000151492, 393.0: 0.000170208, 394.0: 0.000191816, 395.0: 0.000217, 396.0: 0.0002469067, 397.0: 0.00028124, 398.0: 0.00031852, 399.0: 0.0003572667, 400.0: 0.000396, 401.0: 0.0004337147, 402.0: 0.000473024, 403.0: 0.000517876, 404.0: 0.0005722187, 405.0: 0.00064, 406.0: 0.00072456, 407.0: 0.0008255, 408.0: 0.00094116, 409.0: 0.00106988, 410.0: 0.00121, 411.0: 0.001362091, 412.0: 0.001530752, 413.0: 0.001720368, 414.0: 0.001935323, 415.0: 0.00218, 416.0: 0.0024548, 417.0: 0.002764, 418.0: 0.0031178, 419.0: 0.0035264, 420.0: 0.004, 421.0: 0.00454624, 422.0: 0.00515932, 423.0: 0.00582928, 424.0: 0.00654616, 425.0: 0.0073, 426.0: 0.008086507, 427.0: 0.00890872, 428.0: 0.00976768, 429.0: 0.01066443, 430.0: 0.0116, 431.0: 0.01257317, 432.0: 0.01358272, 433.0: 0.01462968, 434.0: 0.01571509, 435.0: 0.01684, 436.0: 0.01800736, 437.0: 0.01921448, 438.0: 0.02045392, 439.0: 0.02171824, 440.0: 0.023, 441.0: 0.02429461, 442.0: 0.02561024, 443.0: 0.02695857, 444.0: 0.02835125, 445.0: 0.0298, 446.0: 0.03131083, 447.0: 0.03288368, 448.0: 0.03452112, 449.0: 0.03622571, 450.0: 0.038, 451.0: 0.03984667, 452.0: 0.041768, 453.0: 0.043766, 454.0: 0.04584267, 455.0: 0.048, 456.0: 0.05024368, 457.0: 0.05257304, 458.0: 0.05498056, 459.0: 0.05745872, 460.0: 0.06, 461.0: 0.06260197, 462.0: 0.06527752, 463.0: 0.06804208, 464.0: 0.07091109, 465.0: 0.0739, 466.0: 0.077016, 467.0: 0.0802664, 468.0: 0.0836668, 469.0: 0.0872328, 470.0: 0.09098, 471.0: 0.09491755, 472.0: 0.09904584, 473.0: 0.1033674, 474.0: 0.1078846, 475.0: 0.1126, 476.0: 0.117532, 477.0: 0.1226744, 478.0: 0.1279928, 479.0: 0.1334528, 480.0: 0.13902, 481.0: 0.1446764, 482.0: 0.1504693, 483.0: 0.1564619, 484.0: 0.1627177, 485.0: 0.1693, 486.0: 0.1762431, 487.0: 0.1835581, 488.0: 0.1912735, 489.0: 0.199418, 490.0: 0.20802, 491.0: 0.2171199, 492.0: 0.2267345, 493.0: 0.2368571, 494.0: 0.2474812, 495.0: 0.2586, 496.0: 0.2701849, 497.0: 0.2822939, 498.0: 0.2950505, 499.0: 0.308578, 500.0: 0.323, 501.0: 0.3384021, 502.0: 0.3546858, 503.0: 0.3716986, 504.0: 0.3892875, 505.0: 0.4073, 506.0: 0.4256299, 507.0: 0.4443096, 508.0: 0.4633944, 509.0: 0.4829395, 510.0: 0.503, 511.0: 0.5235693, 512.0: 0.544512, 513.0: 0.56569, 514.0: 0.5869653, 515.0: 0.6082, 516.0: 0.6293456, 517.0: 0.6503068, 518.0: 0.6708752, 519.0: 0.6908424, 520.0: 0.71, 521.0: 0.7281852, 522.0: 0.7454636, 523.0: 0.7619694, 524.0: 0.7778368, 525.0: 0.7932, 526.0: 0.8081104, 527.0: 0.8224962, 528.0: 0.8363068, 529.0: 0.8494916, 530.0: 0.862, 531.0: 0.8738108, 532.0: 0.8849624, 533.0: 0.8954936, 534.0: 0.9054432, 535.0: 0.9148501, 536.0: 0.9237348, 537.0: 0.9320924, 538.0: 0.9399226, 539.0: 0.9472252, 540.0: 0.954, 541.0: 0.9602561, 542.0: 0.9660074, 543.0: 0.9712606, 544.0: 0.9760225, 545.0: 0.9803, 546.0: 0.9840924, 547.0: 0.9874182, 548.0: 0.9903128, 549.0: 0.9928116, 550.0: 0.9949501, 551.0: 0.9967108, 552.0: 0.9980983, 553.0: 0.999112, 554.0: 0.9997482, 555.0: 1.0, 556.0: 0.9998567, 557.0: 0.9993046, 558.0: 0.9983255, 559.0: 0.9968987, 560.0: 0.995, 561.0: 0.9926005, 562.0: 0.9897426, 563.0: 0.9864444, 564.0: 0.9827241, 565.0: 0.9786, 566.0: 0.9740837, 567.0: 0.9691712, 568.0: 0.9638568, 569.0: 0.9581349, 570.0: 0.952, 571.0: 0.9454504, 572.0: 0.9384992, 573.0: 0.9311628, 574.0: 0.9234576, 575.0: 0.9154, 576.0: 0.9070064, 577.0: 0.8982772, 578.0: 0.8892048, 579.0: 0.8797816, 580.0: 0.87, 581.0: 0.8598613, 582.0: 0.849392, 583.0: 0.838622, 584.0: 0.8275813, 585.0: 0.8163, 586.0: 0.8047947, 587.0: 0.793082, 588.0: 0.781192, 589.0: 0.7691547, 590.0: 0.757, 591.0: 0.7447541, 592.0: 0.7324224, 593.0: 0.7200036, 594.0: 0.7074965, 595.0: 0.6949, 596.0: 0.6822192, 597.0: 0.6694716, 598.0: 0.6566744, 599.0: 0.6438448, 600.0: 0.631, 601.0: 0.6181555, 602.0: 0.6053144, 603.0: 0.5924756, 604.0: 0.5796379, 605.0: 0.5668, 606.0: 0.5539611, 607.0: 0.5411372, 608.0: 0.5283528, 609.0: 0.5156323, 610.0: 0.503, 611.0: 0.4904688, 612.0: 0.4780304, 613.0: 0.4656776, 614.0: 0.4534032, 615.0: 0.4412, 616.0: 0.42908, 617.0: 0.417036, 618.0: 0.405032, 619.0: 0.393032, 620.0: 0.381, 621.0: 0.3689184, 622.0: 0.3568272, 623.0: 0.3447768, 624.0: 0.3328176, 625.0: 0.321, 626.0: 0.3093381, 627.0: 0.2978504, 628.0: 0.2865936, 629.0: 0.2756245, 630.0: 0.265, 631.0: 0.2547632, 632.0: 0.2448896, 633.0: 0.2353344, 634.0: 0.2260528, 635.0: 0.217, 636.0: 0.2081616, 637.0: 0.1995488, 638.0: 0.1911552, 639.0: 0.1829744, 640.0: 0.175, 641.0: 0.1672235, 642.0: 0.1596464, 643.0: 0.1522776, 644.0: 0.1451259, 645.0: 0.1382, 646.0: 0.1315003, 647.0: 0.1250248, 648.0: 0.1187792, 649.0: 0.1127691, 650.0: 0.107, 651.0: 0.1014762, 652.0: 0.09618864, 653.0: 0.09112296, 654.0: 0.08626485, 655.0: 0.0816, 656.0: 0.07712064, 657.0: 0.07282552, 658.0: 0.06871008, 659.0: 0.06476976, 660.0: 0.061, 661.0: 0.05739621, 662.0: 0.05395504, 663.0: 0.05067376, 664.0: 0.04754965, 665.0: 0.04458, 666.0: 0.04175872, 667.0: 0.03908496, 668.0: 0.03656384, 669.0: 0.03420048, 670.0: 0.032, 671.0: 0.02996261, 672.0: 0.02807664, 673.0: 0.02632936, 674.0: 0.02470805, 675.0: 0.0232, 676.0: 0.02180077, 677.0: 0.02050112, 678.0: 0.01928108, 679.0: 0.01812069, 680.0: 0.017, 681.0: 0.01590379, 682.0: 0.01483718, 683.0: 0.01381068, 684.0: 0.01283478, 685.0: 0.01192, 686.0: 0.01106831, 687.0: 0.01027339, 688.0: 0.009533311, 689.0: 0.008846157, 690.0: 0.00821, 691.0: 0.007623781, 692.0: 0.007085424, 693.0: 0.006591476, 694.0: 0.006138485, 695.0: 0.005723, 696.0: 0.005343059, 697.0: 0.004995796, 698.0: 0.004676404, 699.0: 0.004380075, 700.0: 0.004102, 701.0: 0.003838453, 702.0: 0.003589099, 703.0: 0.003354219, 704.0: 0.003134093, 705.0: 0.002929, 706.0: 0.002738139, 707.0: 0.002559876, 708.0: 0.002393244, 709.0: 0.002237275, 710.0: 0.002091, 711.0: 0.001953587, 712.0: 0.00182458, 713.0: 0.00170358, 714.0: 0.001590187, 715.0: 0.001484, 716.0: 0.001384496, 717.0: 0.001291268, 718.0: 0.001204092, 719.0: 0.001122744, 720.0: 0.001047, 721.0: 0.0009765896, 722.0: 0.0009111088, 723.0: 0.0008501332, 724.0: 0.0007932384, 725.0: 0.00074, 726.0: 0.0006900827, 727.0: 0.00064331, 728.0: 0.000599496, 729.0: 0.0005584547, 730.0: 0.00052, 731.0: 0.0004839136, 732.0: 0.0004500528, 733.0: 0.0004183452, 734.0: 0.0003887184, 735.0: 0.0003611, 736.0: 0.0003353835, 737.0: 0.0003114404, 738.0: 0.0002891656, 739.0: 0.0002684539, 740.0: 0.0002492, 741.0: 0.0002313019, 742.0: 0.0002146856, 743.0: 0.0001992884, 744.0: 0.0001850475, 745.0: 0.0001719, 746.0: 0.0001597781, 747.0: 0.0001486044, 748.0: 0.0001383016, 749.0: 0.0001287925, 750.0: 0.00012, 751.0: 0.0001118595, 752.0: 0.0001043224, 753.0: 9.73356e-05, 754.0: 9.084587e-05, 755.0: 8.48e-05, 756.0: 7.914667e-05, 757.0: 7.3858e-05, 758.0: 6.8916e-05, 759.0: 6.430267e-05, 760.0: 6e-05, 761.0: 5.598187e-05, 762.0: 5.22256e-05, 763.0: 4.87184e-05, 764.0: 4.544747e-05, 765.0: 4.24e-05, 766.0: 3.956104e-05, 767.0: 3.691512e-05, 768.0: 3.444868e-05, 769.0: 3.214816e-05, 770.0: 3e-05, 771.0: 2.799125e-05, 772.0: 2.611356e-05, 773.0: 2.436024e-05, 774.0: 2.272461e-05, 775.0: 2.12e-05, 776.0: 1.977855e-05, 777.0: 1.845285e-05, 778.0: 1.721687e-05, 779.0: 1.606459e-05, 780.0: 1.499e-05, 781.0: 1.398728e-05, 782.0: 1.305155e-05, 783.0: 1.217818e-05, 784.0: 1.136254e-05, 785.0: 1.06e-05, 786.0: 9.885877e-06, 787.0: 9.217304e-06, 788.0: 8.592362e-06, 789.0: 8.009133e-06, 790.0: 7.4657e-06, 791.0: 6.959567e-06, 792.0: 6.487995e-06, 793.0: 6.048699e-06, 794.0: 5.639396e-06, 795.0: 5.2578e-06, 796.0: 4.901771e-06, 797.0: 4.56972e-06, 798.0: 4.260194e-06, 799.0: 3.971739e-06, 800.0: 3.7029e-06, 801.0: 3.452163e-06, 802.0: 3.218302e-06, 803.0: 3.0003e-06, 804.0: 2.797139e-06, 805.0: 2.6078e-06, 806.0: 2.43122e-06, 807.0: 2.266531e-06, 808.0: 2.113013e-06, 809.0: 1.969943e-06, 810.0: 1.8366e-06, 811.0: 1.71223e-06, 812.0: 1.596228e-06, 813.0: 1.48809e-06, 814.0: 1.387314e-06, 815.0: 1.2934e-06, 816.0: 1.20582e-06, 817.0: 1.124143e-06, 818.0: 1.048009e-06, 819.0: 9.770578e-07, 820.0: 9.1093e-07, 821.0: 8.492513e-07, 822.0: 7.917212e-07, 823.0: 7.380904e-07, 824.0: 6.881098e-07, 825.0: 6.4153e-07, 826.0: 5.980895e-07, 827.0: 5.575746e-07, 828.0: 5.19808e-07, 829.0: 4.846123e-07, 830.0: 4.5181e-07}), scotopic_lef=SpectralPowerDistribution( 'CIE 1951 Scotopic Standard Observer', {380.0: 0.000589, 381.0: 0.000665, 382.0: 0.000752, 383.0: 0.000854, 384.0: 0.000972, 385.0: 0.001108, 386.0: 0.001268, 387.0: 0.001453, 388.0: 0.001668, 389.0: 0.001918, 390.0: 0.002209, 391.0: 0.002547, 392.0: 0.002939, 393.0: 0.003394, 394.0: 0.003921, 395.0: 0.00453, 396.0: 0.00524, 397.0: 0.00605, 398.0: 0.00698, 399.0: 0.00806, 400.0: 0.00929, 401.0: 0.0107, 402.0: 0.01231, 403.0: 0.01413, 404.0: 0.01619, 405.0: 0.01852, 406.0: 0.02113, 407.0: 0.02405, 408.0: 0.0273, 409.0: 0.03089, 410.0: 0.03484, 411.0: 0.03916, 412.0: 0.0439, 413.0: 0.049, 414.0: 0.0545, 415.0: 0.0604, 416.0: 0.0668, 417.0: 0.0736, 418.0: 0.0808, 419.0: 0.0885, 420.0: 0.0966, 421.0: 0.1052, 422.0: 0.1141, 423.0: 0.1235, 424.0: 0.1334, 425.0: 0.1436, 426.0: 0.1541, 427.0: 0.1651, 428.0: 0.1764, 429.0: 0.1879, 430.0: 0.1998, 431.0: 0.2119, 432.0: 0.2243, 433.0: 0.2369, 434.0: 0.2496, 435.0: 0.2625, 436.0: 0.2755, 437.0: 0.2886, 438.0: 0.3017, 439.0: 0.3149, 440.0: 0.3281, 441.0: 0.3412, 442.0: 0.3543, 443.0: 0.3673, 444.0: 0.3803, 445.0: 0.3931, 446.0: 0.406, 447.0: 0.418, 448.0: 0.431, 449.0: 0.443, 450.0: 0.455, 451.0: 0.467, 452.0: 0.479, 453.0: 0.49, 454.0: 0.502, 455.0: 0.513, 456.0: 0.524, 457.0: 0.535, 458.0: 0.546, 459.0: 0.557, 460.0: 0.567, 461.0: 0.578, 462.0: 0.588, 463.0: 0.599, 464.0: 0.61, 465.0: 0.62, 466.0: 0.631, 467.0: 0.642, 468.0: 0.653, 469.0: 0.664, 470.0: 0.676, 471.0: 0.687, 472.0: 0.699, 473.0: 0.71, 474.0: 0.722, 475.0: 0.734, 476.0: 0.745, 477.0: 0.757, 478.0: 0.769, 479.0: 0.781, 480.0: 0.793, 481.0: 0.805, 482.0: 0.817, 483.0: 0.828, 484.0: 0.84, 485.0: 0.851, 486.0: 0.862, 487.0: 0.873, 488.0: 0.884, 489.0: 0.894, 490.0: 0.904, 491.0: 0.914, 492.0: 0.923, 493.0: 0.932, 494.0: 0.941, 495.0: 0.949, 496.0: 0.957, 497.0: 0.964, 498.0: 0.97, 499.0: 0.976, 500.0: 0.982, 501.0: 0.986, 502.0: 0.99, 503.0: 0.994, 504.0: 0.997, 505.0: 0.998, 506.0: 1.0, 507.0: 1.0, 508.0: 1.0, 509.0: 0.998, 510.0: 0.997, 511.0: 0.994, 512.0: 0.99, 513.0: 0.986, 514.0: 0.981, 515.0: 0.975, 516.0: 0.968, 517.0: 0.961, 518.0: 0.953, 519.0: 0.944, 520.0: 0.935, 521.0: 0.925, 522.0: 0.915, 523.0: 0.904, 524.0: 0.892, 525.0: 0.88, 526.0: 0.867, 527.0: 0.854, 528.0: 0.84, 529.0: 0.826, 530.0: 0.811, 531.0: 0.796, 532.0: 0.781, 533.0: 0.765, 534.0: 0.749, 535.0: 0.733, 536.0: 0.717, 537.0: 0.7, 538.0: 0.683, 539.0: 0.667, 540.0: 0.65, 541.0: 0.633, 542.0: 0.616, 543.0: 0.599, 544.0: 0.581, 545.0: 0.564, 546.0: 0.548, 547.0: 0.531, 548.0: 0.514, 549.0: 0.497, 550.0: 0.481, 551.0: 0.465, 552.0: 0.448, 553.0: 0.433, 554.0: 0.417, 555.0: 0.402, 556.0: 0.3864, 557.0: 0.3715, 558.0: 0.3569, 559.0: 0.3427, 560.0: 0.3288, 561.0: 0.3151, 562.0: 0.3018, 563.0: 0.2888, 564.0: 0.2762, 565.0: 0.2639, 566.0: 0.2519, 567.0: 0.2403, 568.0: 0.2291, 569.0: 0.2182, 570.0: 0.2076, 571.0: 0.1974, 572.0: 0.1876, 573.0: 0.1782, 574.0: 0.169, 575.0: 0.1602, 576.0: 0.1517, 577.0: 0.1436, 578.0: 0.1358, 579.0: 0.1284, 580.0: 0.1212, 581.0: 0.1143, 582.0: 0.1078, 583.0: 0.1015, 584.0: 0.0956, 585.0: 0.0899, 586.0: 0.0845, 587.0: 0.0793, 588.0: 0.0745, 589.0: 0.0699, 590.0: 0.0655, 591.0: 0.0613, 592.0: 0.0574, 593.0: 0.0537, 594.0: 0.0502, 595.0: 0.0469, 596.0: 0.0438, 597.0: 0.0409, 598.0: 0.03816, 599.0: 0.03558, 600.0: 0.03315, 601.0: 0.03087, 602.0: 0.02874, 603.0: 0.02674, 604.0: 0.02487, 605.0: 0.02312, 606.0: 0.02147, 607.0: 0.01994, 608.0: 0.01851, 609.0: 0.01718, 610.0: 0.01593, 611.0: 0.01477, 612.0: 0.01369, 613.0: 0.01269, 614.0: 0.01175, 615.0: 0.01088, 616.0: 0.01007, 617.0: 0.00932, 618.0: 0.00862, 619.0: 0.00797, 620.0: 0.00737, 621.0: 0.00682, 622.0: 0.0063, 623.0: 0.00582, 624.0: 0.00538, 625.0: 0.00497, 626.0: 0.00459, 627.0: 0.00424, 628.0: 0.003913, 629.0: 0.003613, 630.0: 0.003335, 631.0: 0.003079, 632.0: 0.002842, 633.0: 0.002623, 634.0: 0.002421, 635.0: 0.002235, 636.0: 0.002062, 637.0: 0.001903, 638.0: 0.001757, 639.0: 0.001621, 640.0: 0.001497, 641.0: 0.001382, 642.0: 0.001276, 643.0: 0.001178, 644.0: 0.001088, 645.0: 0.001005, 646.0: 0.000928, 647.0: 0.000857, 648.0: 0.000792, 649.0: 0.000732, 650.0: 0.000677, 651.0: 0.000626, 652.0: 0.000579, 653.0: 0.000536, 654.0: 0.000496, 655.0: 0.000459, 656.0: 0.000425, 657.0: 0.0003935, 658.0: 0.0003645, 659.0: 0.0003377, 660.0: 0.0003129, 661.0: 0.0002901, 662.0: 0.0002689, 663.0: 0.0002493, 664.0: 0.0002313, 665.0: 0.0002146, 666.0: 0.0001991, 667.0: 0.0001848, 668.0: 0.0001716, 669.0: 0.0001593, 670.0: 0.000148, 671.0: 0.0001375, 672.0: 0.0001277, 673.0: 0.0001187, 674.0: 0.0001104, 675.0: 0.0001026, 676.0: 9.54e-05, 677.0: 8.88e-05, 678.0: 8.26e-05, 679.0: 7.69e-05, 680.0: 7.15e-05, 681.0: 6.66e-05, 682.0: 6.2e-05, 683.0: 5.78e-05, 684.0: 5.38e-05, 685.0: 5.01e-05, 686.0: 4.67e-05, 687.0: 4.36e-05, 688.0: 4.06e-05, 689.0: 3.789e-05, 690.0: 3.533e-05, 691.0: 3.295e-05, 692.0: 3.075e-05, 693.0: 2.87e-05, 694.0: 2.679e-05, 695.0: 2.501e-05, 696.0: 2.336e-05, 697.0: 2.182e-05, 698.0: 2.038e-05, 699.0: 1.905e-05, 700.0: 1.78e-05, 701.0: 1.664e-05, 702.0: 1.556e-05, 703.0: 1.454e-05, 704.0: 1.36e-05, 705.0: 1.273e-05, 706.0: 1.191e-05, 707.0: 1.114e-05, 708.0: 1.043e-05, 709.0: 9.76e-06, 710.0: 9.14e-06, 711.0: 8.56e-06, 712.0: 8.02e-06, 713.0: 7.51e-06, 714.0: 7.04e-06, 715.0: 6.6e-06, 716.0: 6.18e-06, 717.0: 5.8e-06, 718.0: 5.44e-06, 719.0: 5.1e-06, 720.0: 4.78e-06, 721.0: 4.49e-06, 722.0: 4.21e-06, 723.0: 3.951e-06, 724.0: 3.709e-06, 725.0: 3.482e-06, 726.0: 3.27e-06, 727.0: 3.07e-06, 728.0: 2.884e-06, 729.0: 2.71e-06, 730.0: 2.546e-06, 731.0: 2.393e-06, 732.0: 2.25e-06, 733.0: 2.115e-06, 734.0: 1.989e-06, 735.0: 1.87e-06, 736.0: 1.759e-06, 737.0: 1.655e-06, 738.0: 1.557e-06, 739.0: 1.466e-06, 740.0: 1.379e-06, 741.0: 1.299e-06, 742.0: 1.223e-06, 743.0: 1.151e-06, 744.0: 1.084e-06, 745.0: 1.022e-06, 746.0: 9.62e-07, 747.0: 9.07e-07, 748.0: 8.55e-07, 749.0: 8.06e-07, 750.0: 7.6e-07, 751.0: 7.16e-07, 752.0: 6.75e-07, 753.0: 6.37e-07, 754.0: 6.01e-07, 755.0: 5.67e-07, 756.0: 5.35e-07, 757.0: 5.05e-07, 758.0: 4.77e-07, 759.0: 4.5e-07, 760.0: 4.25e-07, 761.0: 4.01e-07, 762.0: 3.79e-07, 763.0: 3.58e-07, 764.0: 3.382e-07, 765.0: 3.196e-07, 766.0: 3.021e-07, 767.0: 2.855e-07, 768.0: 2.699e-07, 769.0: 2.552e-07, 770.0: 2.413e-07, 771.0: 2.282e-07, 772.0: 2.159e-07, 773.0: 2.042e-07, 774.0: 1.932e-07, 775.0: 1.829e-07, 776.0: 1.731e-07, 777.0: 1.638e-07, 778.0: 1.551e-07, 779.0: 1.468e-07, 780.0: 1.39e-07}))[source]¶

Returns the mesopic luminous efficiency function $V_m(\lambda)$ for given photopic luminance $L_p$.

Parameters:	Lp (numeric) – Photopic luminance $L_p$. source (unicode, optional) – {‘Blue Heavy’, ‘Red Heavy’}, Light source colour temperature. method (unicode, optional) – {‘MOVE’, ‘LRC’}, Method to calculate the weighting factor. photopic_lef (SpectralPowerDistribution, optional) – $V(\lambda)$ photopic luminous efficiency function. scotopic_lef (SpectralPowerDistribution, optional) – $V^\prime(\lambda)$ scotopic luminous efficiency function.
Returns:	Mesopic luminous efficiency function $V_m(\lambda)$.
Return type:	SpectralPowerDistribution

Examples

>>> print(mesopic_luminous_efficiency_function(0.2))
SpectralPowerDistribution('0.2 Lp Mesopic Luminous Efficiency Function', (380.0, 780.0, 1.0))

colour.colorimetry.mesopic_weighting_function(wavelength, Lp, source=u'Blue Heavy', method=u'MOVE', photopic_lef=SpectralPowerDistribution( 'CIE 1924 Photopic Standard Observer', {360.0: 3.917e-06, 361.0: 4.393581e-06, 362.0: 4.929604e-06, 363.0: 5.532136e-06, 364.0: 6.208245e-06, 365.0: 6.965e-06, 366.0: 7.813219e-06, 367.0: 8.767336e-06, 368.0: 9.839844e-06, 369.0: 1.104323e-05, 370.0: 1.239e-05, 371.0: 1.388641e-05, 372.0: 1.555728e-05, 373.0: 1.744296e-05, 374.0: 1.958375e-05, 375.0: 2.202e-05, 376.0: 2.483965e-05, 377.0: 2.804126e-05, 378.0: 3.153104e-05, 379.0: 3.521521e-05, 380.0: 3.9e-05, 381.0: 4.28264e-05, 382.0: 4.69146e-05, 383.0: 5.15896e-05, 384.0: 5.71764e-05, 385.0: 6.4e-05, 386.0: 7.234421e-05, 387.0: 8.221224e-05, 388.0: 9.350816e-05, 389.0: 0.0001061361, 390.0: 0.00012, 391.0: 0.000134984, 392.0: 0.000151492, 393.0: 0.000170208, 394.0: 0.000191816, 395.0: 0.000217, 396.0: 0.0002469067, 397.0: 0.00028124, 398.0: 0.00031852, 399.0: 0.0003572667, 400.0: 0.000396, 401.0: 0.0004337147, 402.0: 0.000473024, 403.0: 0.000517876, 404.0: 0.0005722187, 405.0: 0.00064, 406.0: 0.00072456, 407.0: 0.0008255, 408.0: 0.00094116, 409.0: 0.00106988, 410.0: 0.00121, 411.0: 0.001362091, 412.0: 0.001530752, 413.0: 0.001720368, 414.0: 0.001935323, 415.0: 0.00218, 416.0: 0.0024548, 417.0: 0.002764, 418.0: 0.0031178, 419.0: 0.0035264, 420.0: 0.004, 421.0: 0.00454624, 422.0: 0.00515932, 423.0: 0.00582928, 424.0: 0.00654616, 425.0: 0.0073, 426.0: 0.008086507, 427.0: 0.00890872, 428.0: 0.00976768, 429.0: 0.01066443, 430.0: 0.0116, 431.0: 0.01257317, 432.0: 0.01358272, 433.0: 0.01462968, 434.0: 0.01571509, 435.0: 0.01684, 436.0: 0.01800736, 437.0: 0.01921448, 438.0: 0.02045392, 439.0: 0.02171824, 440.0: 0.023, 441.0: 0.02429461, 442.0: 0.02561024, 443.0: 0.02695857, 444.0: 0.02835125, 445.0: 0.0298, 446.0: 0.03131083, 447.0: 0.03288368, 448.0: 0.03452112, 449.0: 0.03622571, 450.0: 0.038, 451.0: 0.03984667, 452.0: 0.041768, 453.0: 0.043766, 454.0: 0.04584267, 455.0: 0.048, 456.0: 0.05024368, 457.0: 0.05257304, 458.0: 0.05498056, 459.0: 0.05745872, 460.0: 0.06, 461.0: 0.06260197, 462.0: 0.06527752, 463.0: 0.06804208, 464.0: 0.07091109, 465.0: 0.0739, 466.0: 0.077016, 467.0: 0.0802664, 468.0: 0.0836668, 469.0: 0.0872328, 470.0: 0.09098, 471.0: 0.09491755, 472.0: 0.09904584, 473.0: 0.1033674, 474.0: 0.1078846, 475.0: 0.1126, 476.0: 0.117532, 477.0: 0.1226744, 478.0: 0.1279928, 479.0: 0.1334528, 480.0: 0.13902, 481.0: 0.1446764, 482.0: 0.1504693, 483.0: 0.1564619, 484.0: 0.1627177, 485.0: 0.1693, 486.0: 0.1762431, 487.0: 0.1835581, 488.0: 0.1912735, 489.0: 0.199418, 490.0: 0.20802, 491.0: 0.2171199, 492.0: 0.2267345, 493.0: 0.2368571, 494.0: 0.2474812, 495.0: 0.2586, 496.0: 0.2701849, 497.0: 0.2822939, 498.0: 0.2950505, 499.0: 0.308578, 500.0: 0.323, 501.0: 0.3384021, 502.0: 0.3546858, 503.0: 0.3716986, 504.0: 0.3892875, 505.0: 0.4073, 506.0: 0.4256299, 507.0: 0.4443096, 508.0: 0.4633944, 509.0: 0.4829395, 510.0: 0.503, 511.0: 0.5235693, 512.0: 0.544512, 513.0: 0.56569, 514.0: 0.5869653, 515.0: 0.6082, 516.0: 0.6293456, 517.0: 0.6503068, 518.0: 0.6708752, 519.0: 0.6908424, 520.0: 0.71, 521.0: 0.7281852, 522.0: 0.7454636, 523.0: 0.7619694, 524.0: 0.7778368, 525.0: 0.7932, 526.0: 0.8081104, 527.0: 0.8224962, 528.0: 0.8363068, 529.0: 0.8494916, 530.0: 0.862, 531.0: 0.8738108, 532.0: 0.8849624, 533.0: 0.8954936, 534.0: 0.9054432, 535.0: 0.9148501, 536.0: 0.9237348, 537.0: 0.9320924, 538.0: 0.9399226, 539.0: 0.9472252, 540.0: 0.954, 541.0: 0.9602561, 542.0: 0.9660074, 543.0: 0.9712606, 544.0: 0.9760225, 545.0: 0.9803, 546.0: 0.9840924, 547.0: 0.9874182, 548.0: 0.9903128, 549.0: 0.9928116, 550.0: 0.9949501, 551.0: 0.9967108, 552.0: 0.9980983, 553.0: 0.999112, 554.0: 0.9997482, 555.0: 1.0, 556.0: 0.9998567, 557.0: 0.9993046, 558.0: 0.9983255, 559.0: 0.9968987, 560.0: 0.995, 561.0: 0.9926005, 562.0: 0.9897426, 563.0: 0.9864444, 564.0: 0.9827241, 565.0: 0.9786, 566.0: 0.9740837, 567.0: 0.9691712, 568.0: 0.9638568, 569.0: 0.9581349, 570.0: 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736.0: 0.0003353835, 737.0: 0.0003114404, 738.0: 0.0002891656, 739.0: 0.0002684539, 740.0: 0.0002492, 741.0: 0.0002313019, 742.0: 0.0002146856, 743.0: 0.0001992884, 744.0: 0.0001850475, 745.0: 0.0001719, 746.0: 0.0001597781, 747.0: 0.0001486044, 748.0: 0.0001383016, 749.0: 0.0001287925, 750.0: 0.00012, 751.0: 0.0001118595, 752.0: 0.0001043224, 753.0: 9.73356e-05, 754.0: 9.084587e-05, 755.0: 8.48e-05, 756.0: 7.914667e-05, 757.0: 7.3858e-05, 758.0: 6.8916e-05, 759.0: 6.430267e-05, 760.0: 6e-05, 761.0: 5.598187e-05, 762.0: 5.22256e-05, 763.0: 4.87184e-05, 764.0: 4.544747e-05, 765.0: 4.24e-05, 766.0: 3.956104e-05, 767.0: 3.691512e-05, 768.0: 3.444868e-05, 769.0: 3.214816e-05, 770.0: 3e-05, 771.0: 2.799125e-05, 772.0: 2.611356e-05, 773.0: 2.436024e-05, 774.0: 2.272461e-05, 775.0: 2.12e-05, 776.0: 1.977855e-05, 777.0: 1.845285e-05, 778.0: 1.721687e-05, 779.0: 1.606459e-05, 780.0: 1.499e-05, 781.0: 1.398728e-05, 782.0: 1.305155e-05, 783.0: 1.217818e-05, 784.0: 1.136254e-05, 785.0: 1.06e-05, 786.0: 9.885877e-06, 787.0: 9.217304e-06, 788.0: 8.592362e-06, 789.0: 8.009133e-06, 790.0: 7.4657e-06, 791.0: 6.959567e-06, 792.0: 6.487995e-06, 793.0: 6.048699e-06, 794.0: 5.639396e-06, 795.0: 5.2578e-06, 796.0: 4.901771e-06, 797.0: 4.56972e-06, 798.0: 4.260194e-06, 799.0: 3.971739e-06, 800.0: 3.7029e-06, 801.0: 3.452163e-06, 802.0: 3.218302e-06, 803.0: 3.0003e-06, 804.0: 2.797139e-06, 805.0: 2.6078e-06, 806.0: 2.43122e-06, 807.0: 2.266531e-06, 808.0: 2.113013e-06, 809.0: 1.969943e-06, 810.0: 1.8366e-06, 811.0: 1.71223e-06, 812.0: 1.596228e-06, 813.0: 1.48809e-06, 814.0: 1.387314e-06, 815.0: 1.2934e-06, 816.0: 1.20582e-06, 817.0: 1.124143e-06, 818.0: 1.048009e-06, 819.0: 9.770578e-07, 820.0: 9.1093e-07, 821.0: 8.492513e-07, 822.0: 7.917212e-07, 823.0: 7.380904e-07, 824.0: 6.881098e-07, 825.0: 6.4153e-07, 826.0: 5.980895e-07, 827.0: 5.575746e-07, 828.0: 5.19808e-07, 829.0: 4.846123e-07, 830.0: 4.5181e-07}), scotopic_lef=SpectralPowerDistribution( 'CIE 1951 Scotopic Standard Observer', {380.0: 0.000589, 381.0: 0.000665, 382.0: 0.000752, 383.0: 0.000854, 384.0: 0.000972, 385.0: 0.001108, 386.0: 0.001268, 387.0: 0.001453, 388.0: 0.001668, 389.0: 0.001918, 390.0: 0.002209, 391.0: 0.002547, 392.0: 0.002939, 393.0: 0.003394, 394.0: 0.003921, 395.0: 0.00453, 396.0: 0.00524, 397.0: 0.00605, 398.0: 0.00698, 399.0: 0.00806, 400.0: 0.00929, 401.0: 0.0107, 402.0: 0.01231, 403.0: 0.01413, 404.0: 0.01619, 405.0: 0.01852, 406.0: 0.02113, 407.0: 0.02405, 408.0: 0.0273, 409.0: 0.03089, 410.0: 0.03484, 411.0: 0.03916, 412.0: 0.0439, 413.0: 0.049, 414.0: 0.0545, 415.0: 0.0604, 416.0: 0.0668, 417.0: 0.0736, 418.0: 0.0808, 419.0: 0.0885, 420.0: 0.0966, 421.0: 0.1052, 422.0: 0.1141, 423.0: 0.1235, 424.0: 0.1334, 425.0: 0.1436, 426.0: 0.1541, 427.0: 0.1651, 428.0: 0.1764, 429.0: 0.1879, 430.0: 0.1998, 431.0: 0.2119, 432.0: 0.2243, 433.0: 0.2369, 434.0: 0.2496, 435.0: 0.2625, 436.0: 0.2755, 437.0: 0.2886, 438.0: 0.3017, 439.0: 0.3149, 440.0: 0.3281, 441.0: 0.3412, 442.0: 0.3543, 443.0: 0.3673, 444.0: 0.3803, 445.0: 0.3931, 446.0: 0.406, 447.0: 0.418, 448.0: 0.431, 449.0: 0.443, 450.0: 0.455, 451.0: 0.467, 452.0: 0.479, 453.0: 0.49, 454.0: 0.502, 455.0: 0.513, 456.0: 0.524, 457.0: 0.535, 458.0: 0.546, 459.0: 0.557, 460.0: 0.567, 461.0: 0.578, 462.0: 0.588, 463.0: 0.599, 464.0: 0.61, 465.0: 0.62, 466.0: 0.631, 467.0: 0.642, 468.0: 0.653, 469.0: 0.664, 470.0: 0.676, 471.0: 0.687, 472.0: 0.699, 473.0: 0.71, 474.0: 0.722, 475.0: 0.734, 476.0: 0.745, 477.0: 0.757, 478.0: 0.769, 479.0: 0.781, 480.0: 0.793, 481.0: 0.805, 482.0: 0.817, 483.0: 0.828, 484.0: 0.84, 485.0: 0.851, 486.0: 0.862, 487.0: 0.873, 488.0: 0.884, 489.0: 0.894, 490.0: 0.904, 491.0: 0.914, 492.0: 0.923, 493.0: 0.932, 494.0: 0.941, 495.0: 0.949, 496.0: 0.957, 497.0: 0.964, 498.0: 0.97, 499.0: 0.976, 500.0: 0.982, 501.0: 0.986, 502.0: 0.99, 503.0: 0.994, 504.0: 0.997, 505.0: 0.998, 506.0: 1.0, 507.0: 1.0, 508.0: 1.0, 509.0: 0.998, 510.0: 0.997, 511.0: 0.994, 512.0: 0.99, 513.0: 0.986, 514.0: 0.981, 515.0: 0.975, 516.0: 0.968, 517.0: 0.961, 518.0: 0.953, 519.0: 0.944, 520.0: 0.935, 521.0: 0.925, 522.0: 0.915, 523.0: 0.904, 524.0: 0.892, 525.0: 0.88, 526.0: 0.867, 527.0: 0.854, 528.0: 0.84, 529.0: 0.826, 530.0: 0.811, 531.0: 0.796, 532.0: 0.781, 533.0: 0.765, 534.0: 0.749, 535.0: 0.733, 536.0: 0.717, 537.0: 0.7, 538.0: 0.683, 539.0: 0.667, 540.0: 0.65, 541.0: 0.633, 542.0: 0.616, 543.0: 0.599, 544.0: 0.581, 545.0: 0.564, 546.0: 0.548, 547.0: 0.531, 548.0: 0.514, 549.0: 0.497, 550.0: 0.481, 551.0: 0.465, 552.0: 0.448, 553.0: 0.433, 554.0: 0.417, 555.0: 0.402, 556.0: 0.3864, 557.0: 0.3715, 558.0: 0.3569, 559.0: 0.3427, 560.0: 0.3288, 561.0: 0.3151, 562.0: 0.3018, 563.0: 0.2888, 564.0: 0.2762, 565.0: 0.2639, 566.0: 0.2519, 567.0: 0.2403, 568.0: 0.2291, 569.0: 0.2182, 570.0: 0.2076, 571.0: 0.1974, 572.0: 0.1876, 573.0: 0.1782, 574.0: 0.169, 575.0: 0.1602, 576.0: 0.1517, 577.0: 0.1436, 578.0: 0.1358, 579.0: 0.1284, 580.0: 0.1212, 581.0: 0.1143, 582.0: 0.1078, 583.0: 0.1015, 584.0: 0.0956, 585.0: 0.0899, 586.0: 0.0845, 587.0: 0.0793, 588.0: 0.0745, 589.0: 0.0699, 590.0: 0.0655, 591.0: 0.0613, 592.0: 0.0574, 593.0: 0.0537, 594.0: 0.0502, 595.0: 0.0469, 596.0: 0.0438, 597.0: 0.0409, 598.0: 0.03816, 599.0: 0.03558, 600.0: 0.03315, 601.0: 0.03087, 602.0: 0.02874, 603.0: 0.02674, 604.0: 0.02487, 605.0: 0.02312, 606.0: 0.02147, 607.0: 0.01994, 608.0: 0.01851, 609.0: 0.01718, 610.0: 0.01593, 611.0: 0.01477, 612.0: 0.01369, 613.0: 0.01269, 614.0: 0.01175, 615.0: 0.01088, 616.0: 0.01007, 617.0: 0.00932, 618.0: 0.00862, 619.0: 0.00797, 620.0: 0.00737, 621.0: 0.00682, 622.0: 0.0063, 623.0: 0.00582, 624.0: 0.00538, 625.0: 0.00497, 626.0: 0.00459, 627.0: 0.00424, 628.0: 0.003913, 629.0: 0.003613, 630.0: 0.003335, 631.0: 0.003079, 632.0: 0.002842, 633.0: 0.002623, 634.0: 0.002421, 635.0: 0.002235, 636.0: 0.002062, 637.0: 0.001903, 638.0: 0.001757, 639.0: 0.001621, 640.0: 0.001497, 641.0: 0.001382, 642.0: 0.001276, 643.0: 0.001178, 644.0: 0.001088, 645.0: 0.001005, 646.0: 0.000928, 647.0: 0.000857, 648.0: 0.000792, 649.0: 0.000732, 650.0: 0.000677, 651.0: 0.000626, 652.0: 0.000579, 653.0: 0.000536, 654.0: 0.000496, 655.0: 0.000459, 656.0: 0.000425, 657.0: 0.0003935, 658.0: 0.0003645, 659.0: 0.0003377, 660.0: 0.0003129, 661.0: 0.0002901, 662.0: 0.0002689, 663.0: 0.0002493, 664.0: 0.0002313, 665.0: 0.0002146, 666.0: 0.0001991, 667.0: 0.0001848, 668.0: 0.0001716, 669.0: 0.0001593, 670.0: 0.000148, 671.0: 0.0001375, 672.0: 0.0001277, 673.0: 0.0001187, 674.0: 0.0001104, 675.0: 0.0001026, 676.0: 9.54e-05, 677.0: 8.88e-05, 678.0: 8.26e-05, 679.0: 7.69e-05, 680.0: 7.15e-05, 681.0: 6.66e-05, 682.0: 6.2e-05, 683.0: 5.78e-05, 684.0: 5.38e-05, 685.0: 5.01e-05, 686.0: 4.67e-05, 687.0: 4.36e-05, 688.0: 4.06e-05, 689.0: 3.789e-05, 690.0: 3.533e-05, 691.0: 3.295e-05, 692.0: 3.075e-05, 693.0: 2.87e-05, 694.0: 2.679e-05, 695.0: 2.501e-05, 696.0: 2.336e-05, 697.0: 2.182e-05, 698.0: 2.038e-05, 699.0: 1.905e-05, 700.0: 1.78e-05, 701.0: 1.664e-05, 702.0: 1.556e-05, 703.0: 1.454e-05, 704.0: 1.36e-05, 705.0: 1.273e-05, 706.0: 1.191e-05, 707.0: 1.114e-05, 708.0: 1.043e-05, 709.0: 9.76e-06, 710.0: 9.14e-06, 711.0: 8.56e-06, 712.0: 8.02e-06, 713.0: 7.51e-06, 714.0: 7.04e-06, 715.0: 6.6e-06, 716.0: 6.18e-06, 717.0: 5.8e-06, 718.0: 5.44e-06, 719.0: 5.1e-06, 720.0: 4.78e-06, 721.0: 4.49e-06, 722.0: 4.21e-06, 723.0: 3.951e-06, 724.0: 3.709e-06, 725.0: 3.482e-06, 726.0: 3.27e-06, 727.0: 3.07e-06, 728.0: 2.884e-06, 729.0: 2.71e-06, 730.0: 2.546e-06, 731.0: 2.393e-06, 732.0: 2.25e-06, 733.0: 2.115e-06, 734.0: 1.989e-06, 735.0: 1.87e-06, 736.0: 1.759e-06, 737.0: 1.655e-06, 738.0: 1.557e-06, 739.0: 1.466e-06, 740.0: 1.379e-06, 741.0: 1.299e-06, 742.0: 1.223e-06, 743.0: 1.151e-06, 744.0: 1.084e-06, 745.0: 1.022e-06, 746.0: 9.62e-07, 747.0: 9.07e-07, 748.0: 8.55e-07, 749.0: 8.06e-07, 750.0: 7.6e-07, 751.0: 7.16e-07, 752.0: 6.75e-07, 753.0: 6.37e-07, 754.0: 6.01e-07, 755.0: 5.67e-07, 756.0: 5.35e-07, 757.0: 5.05e-07, 758.0: 4.77e-07, 759.0: 4.5e-07, 760.0: 4.25e-07, 761.0: 4.01e-07, 762.0: 3.79e-07, 763.0: 3.58e-07, 764.0: 3.382e-07, 765.0: 3.196e-07, 766.0: 3.021e-07, 767.0: 2.855e-07, 768.0: 2.699e-07, 769.0: 2.552e-07, 770.0: 2.413e-07, 771.0: 2.282e-07, 772.0: 2.159e-07, 773.0: 2.042e-07, 774.0: 1.932e-07, 775.0: 1.829e-07, 776.0: 1.731e-07, 777.0: 1.638e-07, 778.0: 1.551e-07, 779.0: 1.468e-07, 780.0: 1.39e-07}))[source]¶

Calculates the mesopic weighting function factor at given wavelength $\lambda$ using the photopic luminance $L_p$.

Parameters:	wavelength (numeric or array_like) – Wavelength $\lambda$ to calculate the mesopic weighting function factor. Lp (numeric) – Photopic luminance $L_p$. source (unicode, optional) – {‘Blue Heavy’, ‘Red Heavy’}, Light source colour temperature. method (unicode, optional) – {‘MOVE’, ‘LRC’}, Method to calculate the weighting factor. photopic_lef (SpectralPowerDistribution, optional) – $V(\lambda)$ photopic luminous efficiency function. scotopic_lef (SpectralPowerDistribution, optional) – $V^\prime(\lambda)$ scotopic luminous efficiency function.
Returns:	Mesopic weighting function factor.
Return type:	numeric or ndarray

Examples

>>> mesopic_weighting_function(500, 0.2)  
0.7052200...

colour.colorimetry.lightness(Y, method=u'CIE 1976', **kwargs)[source]¶

Returns the Lightness $L^*$ using given method.

Other Parameters:
Parameters:	Y (numeric or array_like) – luminance $Y$. method (unicode, optional) – {‘CIE 1976’, ‘Glasser 1958’, ‘Wyszecki 1963’}, Computation method.
	Y_n (numeric or array_like, optional) – {`lightness_CIE1976()`}, White reference luminance $Y_n$.
Returns:	Lightness $L^*$.
Return type:	numeric or array_like

Notes

Input luminance $Y$ and optional $Y_n$ are in domain [0, 100].
Output Lightness $L^*$ is in range [0, 100].

Examples

>>> lightness(10.08)  
array(37.9856290...)
>>> lightness(10.08, Y_n=100)  
array(37.9856290...)
>>> lightness(10.08, Y_n=95)  
array(38.9165987...)
>>> lightness(10.08, method='Glasser 1958')  
36.2505626...
>>> lightness(10.08, method='Wyszecki 1963')  
37.0041149...

colour.colorimetry.lightness_Glasser1958(Y)[source]¶

Returns the Lightness $L$ of given luminance $Y$ using Glasser et al. (1958) method.

Parameters:	Y (numeric or array_like) – luminance $Y$.
Returns:	Lightness $L$.
Return type:	numeric or array_like

Notes

Input luminance $Y$ is in domain [0, 100].
Output Lightness $L$ is in range [0, 100].

References

[2]	Glasser, L. G., McKinney, A. H., Reilly, C. D., & Schnelle, P. D. (1958). Cube-Root Color Coordinate System. J. Opt. Soc. Am., 48(10), 736–740. doi:10.1364/JOSA.48.000736

Examples

>>> lightness_Glasser1958(10.08)  
36.2505626...

colour.colorimetry.lightness_Wyszecki1963(Y)[source]¶

Returns the Lightness $W$ of given luminance $Y$ using Wyszecki (1963) method.

Parameters:	Y (numeric or array_like) – luminance $Y$.
Returns:	Lightness $W$.
Return type:	numeric or array_like

Notes

Input luminance $Y$ is in domain [0, 100].
Output Lightness $W$ is in range [0, 100].

References

[3]	Wyszecki, G. (1963). Proposal for a New Color-Difference Formula. J. Opt. Soc. Am., 53(11), 1318–1319. doi:10.1364/JOSA.53.001318

Examples

>>> lightness_Wyszecki1963(10.08)  
37.0041149...

colour.colorimetry.lightness_CIE1976(Y, Y_n=100)[source]¶

Returns the Lightness $L^*$ of given luminance $Y$ using given reference white luminance $Y_n$ as per CIE 1976 recommendation.

Parameters:	Y (numeric or array_like) – luminance $Y$. Y_n (numeric or array_like, optional) – White reference luminance $Y_n$.
Returns:	Lightness $L^*$.
Return type:	numeric or array_like

Notes

Input luminance $Y$ and $Y_n$ are in domain [0, 100].
Output Lightness $L^*$ is in range [0, 100].

References

[4]	Wyszecki, G., & Stiles, W. S. (2000). CIE 1976 (Luv*)-Space and Color-Difference Formula. In Color Science: Concepts and Methods, Quantitative Data and Formulae (p. 167). Wiley. ISBN:978-0471399186

[5]	Lindbloom, B. (2003). A Continuity Study of the CIE L* Function. Retrieved February 24, 2014, from http://brucelindbloom.com/LContinuity.html

Examples

>>> lightness_CIE1976(10.08)  
array(37.9856290...)

colour.colorimetry.luminance(LV, method=u'CIE 1976', **kwargs)[source]¶

Returns the luminance $Y$ of given Lightness $L^*$ or given Munsell value $V$.

Other Parameters:
Parameters:	LV (numeric or array_like) – Lightness $L^$ or Munsell* value $V$. method (unicode, optional) – {‘CIE 1976’, ‘Newhall 1943’, ‘ASTM D1535-08’}, Computation method.
	Y_n (numeric or array_like, optional) – {`luminance_CIE1976()`}, White reference luminance $Y_n$.
Returns:	luminance $Y$.
Return type:	numeric or array_like

Notes

Input LV is in domain [0, 100] or [0, 10] and optional luminance $Y_n$ is in domain [0, 100].
Output luminance $Y$ is in range [0, 100].

Examples

>>> luminance(37.98562910)  
array(10.0800000...)
>>> luminance(37.98562910, Y_n=100)  
array(10.0800000...)
>>> luminance(37.98562910, Y_n=95)  
array(9.5760000...)
>>> luminance(3.74629715, method='Newhall 1943')  
10.4089874...
>>> luminance(3.74629715, method='ASTM D1535-08')  
10.1488096...

colour.colorimetry.luminance_Newhall1943(V)[source]¶

Returns the luminance $R_Y$ of given Munsell value $V$ using Newhall et al. (1943) method.

Parameters:	V (numeric or array_like) – Munsell value $V$.
Returns:	luminance $R_Y$.
Return type:	numeric or array_like

Notes

Input Munsell value $V$ is in domain [0, 10].
Output luminance $R_Y$ is in range [0, 100].

References

[1]	Newhall, S. M., Nickerson, D., & Judd, D. B. (1943). Final report of the OSA subcommittee on the spacing of the munsell colors. JOSA, 33(7), 385. doi:10.1364/JOSA.33.000385

Examples

>>> luminance_Newhall1943(3.74629715382)  
10.4089874...

colour.colorimetry.luminance_ASTMD153508(V)[source]¶

Returns the luminance $Y$ of given Munsell value $V$ using ASTM D1535-08e1 method.

Parameters:	V (numeric or array_like) – Munsell value $V$.
Returns:	luminance $Y$.
Return type:	numeric or array_like

Notes

Input Munsell value $V$ is in domain [0, 10].
Output luminance $Y$ is in range [0, 100].

References

[4]	ASTM International. (n.d.). ASTM D1535-08e1 Standard Practice for Specifying Color by the Munsell System. doi:10.1520/D1535-08E01

Examples

>>> luminance_ASTMD153508(3.74629715382)  
10.1488096...

colour.colorimetry.luminance_CIE1976(Lstar, Y_n=100)[source]¶

Returns the luminance $Y$ of given Lightness $L^*$ with given reference white luminance $Y_n$.

Parameters:	Lstar (numeric or array_like) – Lightness $L^$ Y_n* (numeric or array_like) – White reference luminance $Y_n$.
Returns:	luminance $Y$.
Return type:	numeric or array_like

Notes

Input Lightness $L^*$ and reference white luminance $Y_n$ are in domain [0, 100].
Output luminance $Y$ is in range [0, 100].

References

[2]	Wyszecki, G., & Stiles, W. S. (2000). CIE 1976 (Luv*)-Space and Color-Difference Formula. In Color Science: Concepts and Methods, Quantitative Data and Formulae (p. 167). Wiley. ISBN:978-0471399186

[3]	Lindbloom, B. (2003). A Continuity Study of the CIE L* Function. Retrieved February 24, 2014, from http://brucelindbloom.com/LContinuity.html

Examples

>>> luminance_CIE1976(37.98562910)  
array(10.0800000...)
>>> luminance_CIE1976(37.98562910, 95)  
array(9.5760000...)

colour.colorimetry.dominant_wavelength(xy, xy_n, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 403.0: 0.01878122, 404.0: 0.02074801, 405.0: 0.02319, 406.0: 0.02620736, 407.0: 0.02978248, 408.0: 0.03388092, 409.0: 0.03846824, 410.0: 0.04351, 411.0: 0.0489956, 412.0: 0.0550226, 413.0: 0.0617188, 414.0: 0.069212, 415.0: 0.07763, 416.0: 0.08695811, 417.0: 0.09717672, 418.0: 0.1084063, 419.0: 0.1207672, 420.0: 0.13438, 421.0: 0.1493582, 422.0: 0.1653957, 423.0: 0.1819831, 424.0: 0.198611, 425.0: 0.21477, 426.0: 0.2301868, 427.0: 0.2448797, 428.0: 0.2587773, 429.0: 0.2718079, 430.0: 0.2839, 431.0: 0.2949438, 432.0: 0.3048965, 433.0: 0.3137873, 434.0: 0.3216454, 435.0: 0.3285, 436.0: 0.3343513, 437.0: 0.3392101, 438.0: 0.3431213, 439.0: 0.3461296, 440.0: 0.34828, 441.0: 0.3495999, 442.0: 0.3501474, 443.0: 0.350013, 444.0: 0.349287, 445.0: 0.34806, 446.0: 0.3463733, 447.0: 0.3442624, 448.0: 0.3418088, 449.0: 0.3390941, 450.0: 0.3362, 451.0: 0.3331977, 452.0: 0.3300411, 453.0: 0.3266357, 454.0: 0.3228868, 455.0: 0.3187, 456.0: 0.3140251, 457.0: 0.308884, 458.0: 0.3032904, 459.0: 0.2972579, 460.0: 0.2908, 461.0: 0.2839701, 462.0: 0.2767214, 463.0: 0.2689178, 464.0: 0.2604227, 465.0: 0.2511, 466.0: 0.2408475, 467.0: 0.2298512, 468.0: 0.2184072, 469.0: 0.2068115, 470.0: 0.19536, 471.0: 0.1842136, 472.0: 0.1733273, 473.0: 0.1626881, 474.0: 0.1522833, 475.0: 0.1421, 476.0: 0.1321786, 477.0: 0.1225696, 478.0: 0.1132752, 479.0: 0.1042979, 480.0: 0.09564, 481.0: 0.08729955, 482.0: 0.07930804, 483.0: 0.07171776, 484.0: 0.06458099, 485.0: 0.05795001, 486.0: 0.05186211, 487.0: 0.04628152, 488.0: 0.04115088, 489.0: 0.03641283, 490.0: 0.03201, 491.0: 0.0279172, 492.0: 0.0241444, 493.0: 0.020687, 494.0: 0.0175404, 495.0: 0.0147, 496.0: 0.01216179, 497.0: 0.00991996, 498.0: 0.00796724, 499.0: 0.006296346, 500.0: 0.0049, 501.0: 0.003777173, 502.0: 0.00294532, 503.0: 0.00242488, 504.0: 0.002236293, 505.0: 0.0024, 506.0: 0.00292552, 507.0: 0.00383656, 508.0: 0.00517484, 509.0: 0.00698208, 510.0: 0.0093, 511.0: 0.01214949, 512.0: 0.01553588, 513.0: 0.01947752, 514.0: 0.02399277, 515.0: 0.0291, 516.0: 0.03481485, 517.0: 0.04112016, 518.0: 0.04798504, 519.0: 0.05537861, 520.0: 0.06327, 521.0: 0.07163501, 522.0: 0.08046224, 523.0: 0.08973996, 524.0: 0.09945645, 525.0: 0.1096, 526.0: 0.1201674, 527.0: 0.1311145, 528.0: 0.1423679, 529.0: 0.1538542, 530.0: 0.1655, 531.0: 0.1772571, 532.0: 0.18914, 533.0: 0.2011694, 534.0: 0.2133658, 535.0: 0.2257499, 536.0: 0.2383209, 537.0: 0.2510668, 538.0: 0.2639922, 539.0: 0.2771017, 540.0: 0.2904, 541.0: 0.3038912, 542.0: 0.3175726, 543.0: 0.3314384, 544.0: 0.3454828, 545.0: 0.3597, 546.0: 0.3740839, 547.0: 0.3886396, 548.0: 0.4033784, 549.0: 0.4183115, 550.0: 0.4334499, 551.0: 0.4487953, 552.0: 0.464336, 553.0: 0.480064, 554.0: 0.4959713, 555.0: 0.5120501, 556.0: 0.5282959, 557.0: 0.5446916, 558.0: 0.5612094, 559.0: 0.5778215, 560.0: 0.5945, 561.0: 0.6112209, 562.0: 0.6279758, 563.0: 0.6447602, 564.0: 0.6615697, 565.0: 0.6784, 566.0: 0.6952392, 567.0: 0.7120586, 568.0: 0.7288284, 569.0: 0.7455188, 570.0: 0.7621, 571.0: 0.7785432, 572.0: 0.7948256, 573.0: 0.8109264, 574.0: 0.8268248, 575.0: 0.8425, 576.0: 0.8579325, 577.0: 0.8730816, 578.0: 0.8878944, 579.0: 0.9023181, 580.0: 0.9163, 581.0: 0.9297995, 582.0: 0.9427984, 583.0: 0.9552776, 584.0: 0.9672179, 585.0: 0.9786, 586.0: 0.9893856, 587.0: 0.9995488, 588.0: 1.0090892, 589.0: 1.0180064, 590.0: 1.0263, 591.0: 1.0339827, 592.0: 1.040986, 593.0: 1.047188, 594.0: 1.0524667, 595.0: 1.0567, 596.0: 1.0597944, 597.0: 1.0617992, 598.0: 1.0628068, 599.0: 1.0629096, 600.0: 1.0622, 601.0: 1.0607352, 602.0: 1.0584436, 603.0: 1.0552244, 604.0: 1.0509768, 605.0: 1.0456, 606.0: 1.0390369, 607.0: 1.0313608, 608.0: 1.0226662, 609.0: 1.0130477, 610.0: 1.0026, 611.0: 0.9913675, 612.0: 0.9793314, 613.0: 0.9664916, 614.0: 0.9528479, 615.0: 0.9384, 616.0: 0.923194, 617.0: 0.907244, 618.0: 0.890502, 619.0: 0.87292, 620.0: 0.8544499, 621.0: 0.835084, 622.0: 0.814946, 623.0: 0.794186, 624.0: 0.772954, 625.0: 0.7514, 626.0: 0.7295836, 627.0: 0.7075888, 628.0: 0.6856022, 629.0: 0.6638104, 630.0: 0.6424, 631.0: 0.6215149, 632.0: 0.6011138, 633.0: 0.5811052, 634.0: 0.5613977, 635.0: 0.5419, 636.0: 0.5225995, 637.0: 0.5035464, 638.0: 0.4847436, 639.0: 0.4661939, 640.0: 0.4479, 641.0: 0.4298613, 642.0: 0.412098, 643.0: 0.394644, 644.0: 0.3775333, 645.0: 0.3608, 646.0: 0.3444563, 647.0: 0.3285168, 648.0: 0.3130192, 649.0: 0.2980011, 650.0: 0.2835, 651.0: 0.2695448, 652.0: 0.2561184, 653.0: 0.2431896, 654.0: 0.2307272, 655.0: 0.2187, 656.0: 0.2070971, 657.0: 0.1959232, 658.0: 0.1851708, 659.0: 0.1748323, 660.0: 0.1649, 661.0: 0.1553667, 662.0: 0.14623, 663.0: 0.13749, 664.0: 0.1291467, 665.0: 0.1212, 666.0: 0.1136397, 667.0: 0.106465, 668.0: 0.09969044, 669.0: 0.09333061, 670.0: 0.0874, 671.0: 0.08190096, 672.0: 0.07680428, 673.0: 0.07207712, 674.0: 0.06768664, 675.0: 0.0636, 676.0: 0.05980685, 677.0: 0.05628216, 678.0: 0.05297104, 679.0: 0.04981861, 680.0: 0.04677, 681.0: 0.04378405, 682.0: 0.04087536, 683.0: 0.03807264, 684.0: 0.03540461, 685.0: 0.0329, 686.0: 0.03056419, 687.0: 0.02838056, 688.0: 0.02634484, 689.0: 0.02445275, 690.0: 0.0227, 691.0: 0.02108429, 692.0: 0.01959988, 693.0: 0.01823732, 694.0: 0.01698717, 695.0: 0.01584, 696.0: 0.01479064, 697.0: 0.01383132, 698.0: 0.01294868, 699.0: 0.0121292, 700.0: 0.01135916, 701.0: 0.01062935, 702.0: 0.009938846, 703.0: 0.009288422, 704.0: 0.008678854, 705.0: 0.008110916, 706.0: 0.007582388, 707.0: 0.007088746, 708.0: 0.006627313, 709.0: 0.006195408, 710.0: 0.005790346, 711.0: 0.005409826, 712.0: 0.005052583, 713.0: 0.004717512, 714.0: 0.004403507, 715.0: 0.004109457, 716.0: 0.003833913, 717.0: 0.003575748, 718.0: 0.003334342, 719.0: 0.003109075, 720.0: 0.002899327, 721.0: 0.002704348, 722.0: 0.00252302, 723.0: 0.002354168, 724.0: 0.002196616, 725.0: 0.00204919, 726.0: 0.00191096, 727.0: 0.001781438, 728.0: 0.00166011, 729.0: 0.001546459, 730.0: 0.001439971, 731.0: 0.001340042, 732.0: 0.001246275, 733.0: 0.001158471, 734.0: 0.00107643, 735.0: 0.0009999493, 736.0: 0.0009287358, 737.0: 0.0008624332, 738.0: 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543.0: 0.01586364, 544.0: 0.01458461, 545.0: 0.0134, 546.0: 0.01230723, 547.0: 0.01130188, 548.0: 0.01037792, 549.0: 0.009529306, 550.0: 0.008749999, 551.0: 0.0080352, 552.0: 0.0073816, 553.0: 0.0067854, 554.0: 0.0062428, 555.0: 0.005749999, 556.0: 0.0053036, 557.0: 0.0048998, 558.0: 0.0045342, 559.0: 0.0042024, 560.0: 0.0039, 561.0: 0.0036232, 562.0: 0.0033706, 563.0: 0.0031414, 564.0: 0.0029348, 565.0: 0.002749999, 566.0: 0.0025852, 567.0: 0.0024386, 568.0: 0.0023094, 569.0: 0.0021968, 570.0: 0.0021, 571.0: 0.002017733, 572.0: 0.0019482, 573.0: 0.0018898, 574.0: 0.001840933, 575.0: 0.0018, 576.0: 0.001766267, 577.0: 0.0017378, 578.0: 0.0017112, 579.0: 0.001683067, 580.0: 0.001650001, 581.0: 0.001610133, 582.0: 0.0015644, 583.0: 0.0015136, 584.0: 0.001458533, 585.0: 0.0014, 586.0: 0.001336667, 587.0: 0.00127, 588.0: 0.001205, 589.0: 0.001146667, 590.0: 0.0011, 591.0: 0.0010688, 592.0: 0.0010494, 593.0: 0.0010356, 594.0: 0.0010212, 595.0: 0.001, 596.0: 0.00096864, 597.0: 0.00092992, 598.0: 0.00088688, 599.0: 0.00084256, 600.0: 0.0008, 601.0: 0.00076096, 602.0: 0.00072368, 603.0: 0.00068592, 604.0: 0.00064544, 605.0: 0.0006, 606.0: 0.0005478667, 607.0: 0.0004916, 608.0: 0.0004354, 609.0: 0.0003834667, 610.0: 0.00034, 611.0: 0.0003072533, 612.0: 0.00028316, 613.0: 0.00026544, 614.0: 0.0002518133, 615.0: 0.00024, 616.0: 0.0002295467, 617.0: 0.00022064, 618.0: 0.00021196, 619.0: 0.0002021867, 620.0: 0.00019, 621.0: 0.0001742133, 622.0: 0.00015564, 623.0: 0.00013596, 624.0: 0.0001168533, 625.0: 0.0001, 626.0: 8.613333e-05, 627.0: 7.46e-05, 628.0: 6.5e-05, 629.0: 5.693333e-05, 630.0: 4.999999e-05, 631.0: 4.416e-05, 632.0: 3.948e-05, 633.0: 3.572e-05, 634.0: 3.264e-05, 635.0: 3e-05, 636.0: 2.765333e-05, 637.0: 2.556e-05, 638.0: 2.364e-05, 639.0: 2.181333e-05, 640.0: 2e-05, 641.0: 1.813333e-05, 642.0: 1.62e-05, 643.0: 1.42e-05, 644.0: 1.213333e-05, 645.0: 1e-05, 646.0: 7.733333e-06, 647.0: 5.4e-06, 648.0: 3.2e-06, 649.0: 1.333333e-06, 650.0: 0.0, 651.0: 0.0, 652.0: 0.0, 653.0: 0.0, 654.0: 0.0, 655.0: 0.0, 656.0: 0.0, 657.0: 0.0, 658.0: 0.0, 659.0: 0.0, 660.0: 0.0, 661.0: 0.0, 662.0: 0.0, 663.0: 0.0, 664.0: 0.0, 665.0: 0.0, 666.0: 0.0, 667.0: 0.0, 668.0: 0.0, 669.0: 0.0, 670.0: 0.0, 671.0: 0.0, 672.0: 0.0, 673.0: 0.0, 674.0: 0.0, 675.0: 0.0, 676.0: 0.0, 677.0: 0.0, 678.0: 0.0, 679.0: 0.0, 680.0: 0.0, 681.0: 0.0, 682.0: 0.0, 683.0: 0.0, 684.0: 0.0, 685.0: 0.0, 686.0: 0.0, 687.0: 0.0, 688.0: 0.0, 689.0: 0.0, 690.0: 0.0, 691.0: 0.0, 692.0: 0.0, 693.0: 0.0, 694.0: 0.0, 695.0: 0.0, 696.0: 0.0, 697.0: 0.0, 698.0: 0.0, 699.0: 0.0, 700.0: 0.0, 701.0: 0.0, 702.0: 0.0, 703.0: 0.0, 704.0: 0.0, 705.0: 0.0, 706.0: 0.0, 707.0: 0.0, 708.0: 0.0, 709.0: 0.0, 710.0: 0.0, 711.0: 0.0, 712.0: 0.0, 713.0: 0.0, 714.0: 0.0, 715.0: 0.0, 716.0: 0.0, 717.0: 0.0, 718.0: 0.0, 719.0: 0.0, 720.0: 0.0, 721.0: 0.0, 722.0: 0.0, 723.0: 0.0, 724.0: 0.0, 725.0: 0.0, 726.0: 0.0, 727.0: 0.0, 728.0: 0.0, 729.0: 0.0, 730.0: 0.0, 731.0: 0.0, 732.0: 0.0, 733.0: 0.0, 734.0: 0.0, 735.0: 0.0, 736.0: 0.0, 737.0: 0.0, 738.0: 0.0, 739.0: 0.0, 740.0: 0.0, 741.0: 0.0, 742.0: 0.0, 743.0: 0.0, 744.0: 0.0, 745.0: 0.0, 746.0: 0.0, 747.0: 0.0, 748.0: 0.0, 749.0: 0.0, 750.0: 0.0, 751.0: 0.0, 752.0: 0.0, 753.0: 0.0, 754.0: 0.0, 755.0: 0.0, 756.0: 0.0, 757.0: 0.0, 758.0: 0.0, 759.0: 0.0, 760.0: 0.0, 761.0: 0.0, 762.0: 0.0, 763.0: 0.0, 764.0: 0.0, 765.0: 0.0, 766.0: 0.0, 767.0: 0.0, 768.0: 0.0, 769.0: 0.0, 770.0: 0.0, 771.0: 0.0, 772.0: 0.0, 773.0: 0.0, 774.0: 0.0, 775.0: 0.0, 776.0: 0.0, 777.0: 0.0, 778.0: 0.0, 779.0: 0.0, 780.0: 0.0, 781.0: 0.0, 782.0: 0.0, 783.0: 0.0, 784.0: 0.0, 785.0: 0.0, 786.0: 0.0, 787.0: 0.0, 788.0: 0.0, 789.0: 0.0, 790.0: 0.0, 791.0: 0.0, 792.0: 0.0, 793.0: 0.0, 794.0: 0.0, 795.0: 0.0, 796.0: 0.0, 797.0: 0.0, 798.0: 0.0, 799.0: 0.0, 800.0: 0.0, 801.0: 0.0, 802.0: 0.0, 803.0: 0.0, 804.0: 0.0, 805.0: 0.0, 806.0: 0.0, 807.0: 0.0, 808.0: 0.0, 809.0: 0.0, 810.0: 0.0, 811.0: 0.0, 812.0: 0.0, 813.0: 0.0, 814.0: 0.0, 815.0: 0.0, 816.0: 0.0, 817.0: 0.0, 818.0: 0.0, 819.0: 0.0, 820.0: 0.0, 821.0: 0.0, 822.0: 0.0, 823.0: 0.0, 824.0: 0.0, 825.0: 0.0, 826.0: 0.0, 827.0: 0.0, 828.0: 0.0, 829.0: 0.0, 830.0: 0.0}}, 'CIE 1931 2$^\circ$ Standard Observer'), reverse=False)[source]¶

Returns the dominant wavelength $\lambda_d$ for given colour stimulus $xy$ and the related $xy_wl$ first and $xy_{cw}$ second intersection coordinates with the spectral locus.

In the eventuality where the $xy_wl$ first intersection coordinates are on the line of purples, the complementary wavelength will be computed in lieu.

The complementary wavelength is indicated by a negative sign and the $xy_{cw}$ second intersection coordinates which are set by default to the same value than $xy_wl$ first intersection coordinates will be set to the complementary dominant wavelength intersection coordinates with the spectral locus.

Parameters:	xy (array_like) – Colour stimulus xy chromaticity coordinates. xy_n (array_like) – Achromatic stimulus xy chromaticity coordinates. cmfs (XYZ_ColourMatchingFunctions, optional) – Standard observer colour matching functions. reverse (bool, optional) – Reverse the computation direction to retrieve the complementary wavelength.
Returns:	Dominant wavelength, first intersection point xy chromaticity coordinates, second intersection point xy chromaticity coordinates.
Return type:	tuple

See also

complementary_wavelength()

Examples

Dominant wavelength computation:

>>> from pprint import pprint
>>> xy = np.array([0.26415, 0.37770])
>>> xy_n = np.array([0.31270, 0.32900])
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> pprint(dominant_wavelength(xy, xy_n, cmfs))  
(array(504...),
 array([ 0.0036969...,  0.6389577...]),
 array([ 0.0036969...,  0.6389577...]))

Complementary dominant wavelength is returned if the first intersection is located on the line of purples:

>>> xy = np.array([0.35000, 0.25000])
>>> pprint(dominant_wavelength(xy, xy_n, cmfs))  
(array(-520...),
 array([ 0.4133314...,  0.1158663...]),
 array([ 0.0743553...,  0.8338050...]))

colour.colorimetry.complementary_wavelength(xy, xy_n, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 403.0: 0.01878122, 404.0: 0.02074801, 405.0: 0.02319, 406.0: 0.02620736, 407.0: 0.02978248, 408.0: 0.03388092, 409.0: 0.03846824, 410.0: 0.04351, 411.0: 0.0489956, 412.0: 0.0550226, 413.0: 0.0617188, 414.0: 0.069212, 415.0: 0.07763, 416.0: 0.08695811, 417.0: 0.09717672, 418.0: 0.1084063, 419.0: 0.1207672, 420.0: 0.13438, 421.0: 0.1493582, 422.0: 0.1653957, 423.0: 0.1819831, 424.0: 0.198611, 425.0: 0.21477, 426.0: 0.2301868, 427.0: 0.2448797, 428.0: 0.2587773, 429.0: 0.2718079, 430.0: 0.2839, 431.0: 0.2949438, 432.0: 0.3048965, 433.0: 0.3137873, 434.0: 0.3216454, 435.0: 0.3285, 436.0: 0.3343513, 437.0: 0.3392101, 438.0: 0.3431213, 439.0: 0.3461296, 440.0: 0.34828, 441.0: 0.3495999, 442.0: 0.3501474, 443.0: 0.350013, 444.0: 0.349287, 445.0: 0.34806, 446.0: 0.3463733, 447.0: 0.3442624, 448.0: 0.3418088, 449.0: 0.3390941, 450.0: 0.3362, 451.0: 0.3331977, 452.0: 0.3300411, 453.0: 0.3266357, 454.0: 0.3228868, 455.0: 0.3187, 456.0: 0.3140251, 457.0: 0.308884, 458.0: 0.3032904, 459.0: 0.2972579, 460.0: 0.2908, 461.0: 0.2839701, 462.0: 0.2767214, 463.0: 0.2689178, 464.0: 0.2604227, 465.0: 0.2511, 466.0: 0.2408475, 467.0: 0.2298512, 468.0: 0.2184072, 469.0: 0.2068115, 470.0: 0.19536, 471.0: 0.1842136, 472.0: 0.1733273, 473.0: 0.1626881, 474.0: 0.1522833, 475.0: 0.1421, 476.0: 0.1321786, 477.0: 0.1225696, 478.0: 0.1132752, 479.0: 0.1042979, 480.0: 0.09564, 481.0: 0.08729955, 482.0: 0.07930804, 483.0: 0.07171776, 484.0: 0.06458099, 485.0: 0.05795001, 486.0: 0.05186211, 487.0: 0.04628152, 488.0: 0.04115088, 489.0: 0.03641283, 490.0: 0.03201, 491.0: 0.0279172, 492.0: 0.0241444, 493.0: 0.020687, 494.0: 0.0175404, 495.0: 0.0147, 496.0: 0.01216179, 497.0: 0.00991996, 498.0: 0.00796724, 499.0: 0.006296346, 500.0: 0.0049, 501.0: 0.003777173, 502.0: 0.00294532, 503.0: 0.00242488, 504.0: 0.002236293, 505.0: 0.0024, 506.0: 0.00292552, 507.0: 0.00383656, 508.0: 0.00517484, 509.0: 0.00698208, 510.0: 0.0093, 511.0: 0.01214949, 512.0: 0.01553588, 513.0: 0.01947752, 514.0: 0.02399277, 515.0: 0.0291, 516.0: 0.03481485, 517.0: 0.04112016, 518.0: 0.04798504, 519.0: 0.05537861, 520.0: 0.06327, 521.0: 0.07163501, 522.0: 0.08046224, 523.0: 0.08973996, 524.0: 0.09945645, 525.0: 0.1096, 526.0: 0.1201674, 527.0: 0.1311145, 528.0: 0.1423679, 529.0: 0.1538542, 530.0: 0.1655, 531.0: 0.1772571, 532.0: 0.18914, 533.0: 0.2011694, 534.0: 0.2133658, 535.0: 0.2257499, 536.0: 0.2383209, 537.0: 0.2510668, 538.0: 0.2639922, 539.0: 0.2771017, 540.0: 0.2904, 541.0: 0.3038912, 542.0: 0.3175726, 543.0: 0.3314384, 544.0: 0.3454828, 545.0: 0.3597, 546.0: 0.3740839, 547.0: 0.3886396, 548.0: 0.4033784, 549.0: 0.4183115, 550.0: 0.4334499, 551.0: 0.4487953, 552.0: 0.464336, 553.0: 0.480064, 554.0: 0.4959713, 555.0: 0.5120501, 556.0: 0.5282959, 557.0: 0.5446916, 558.0: 0.5612094, 559.0: 0.5778215, 560.0: 0.5945, 561.0: 0.6112209, 562.0: 0.6279758, 563.0: 0.6447602, 564.0: 0.6615697, 565.0: 0.6784, 566.0: 0.6952392, 567.0: 0.7120586, 568.0: 0.7288284, 569.0: 0.7455188, 570.0: 0.7621, 571.0: 0.7785432, 572.0: 0.7948256, 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797.0: 4.56972e-06, 798.0: 4.260194e-06, 799.0: 3.971739e-06, 800.0: 3.7029e-06, 801.0: 3.452163e-06, 802.0: 3.218302e-06, 803.0: 3.0003e-06, 804.0: 2.797139e-06, 805.0: 2.6078e-06, 806.0: 2.43122e-06, 807.0: 2.266531e-06, 808.0: 2.113013e-06, 809.0: 1.969943e-06, 810.0: 1.8366e-06, 811.0: 1.71223e-06, 812.0: 1.596228e-06, 813.0: 1.48809e-06, 814.0: 1.387314e-06, 815.0: 1.2934e-06, 816.0: 1.20582e-06, 817.0: 1.124143e-06, 818.0: 1.048009e-06, 819.0: 9.77058e-07, 820.0: 9.1093e-07, 821.0: 8.49251e-07, 822.0: 7.91721e-07, 823.0: 7.3809e-07, 824.0: 6.8811e-07, 825.0: 6.4153e-07, 826.0: 5.9809e-07, 827.0: 5.57575e-07, 828.0: 5.19808e-07, 829.0: 4.84612e-07, 830.0: 4.5181e-07}, u'z_bar': {360.0: 0.0006061, 361.0: 0.0006808792, 362.0: 0.0007651456, 363.0: 0.0008600124, 364.0: 0.0009665928, 365.0: 0.001086, 366.0: 0.001220586, 367.0: 0.001372729, 368.0: 0.001543579, 369.0: 0.001734286, 370.0: 0.001946, 371.0: 0.002177777, 372.0: 0.002435809, 373.0: 0.002731953, 374.0: 0.003078064, 375.0: 0.003486, 376.0: 0.003975227, 377.0: 0.00454088, 378.0: 0.00515832, 379.0: 0.005802907, 380.0: 0.006450001, 381.0: 0.007083216, 382.0: 0.007745488, 383.0: 0.008501152, 384.0: 0.009414544, 385.0: 0.01054999, 386.0: 0.0119658, 387.0: 0.01365587, 388.0: 0.01558805, 389.0: 0.01773015, 390.0: 0.02005001, 391.0: 0.02251136, 392.0: 0.02520288, 393.0: 0.02827972, 394.0: 0.03189704, 395.0: 0.03621, 396.0: 0.04143771, 397.0: 0.04750372, 398.0: 0.05411988, 399.0: 0.06099803, 400.0: 0.06785001, 401.0: 0.07448632, 402.0: 0.08136156, 403.0: 0.08915364, 404.0: 0.09854048, 405.0: 0.1102, 406.0: 0.1246133, 407.0: 0.1417017, 408.0: 0.1613035, 409.0: 0.1832568, 410.0: 0.2074, 411.0: 0.2336921, 412.0: 0.2626114, 413.0: 0.2947746, 414.0: 0.3307985, 415.0: 0.3713, 416.0: 0.4162091, 417.0: 0.4654642, 418.0: 0.5196948, 419.0: 0.5795303, 420.0: 0.6456, 421.0: 0.7184838, 422.0: 0.7967133, 423.0: 0.8778459, 424.0: 0.959439, 425.0: 1.0390501, 426.0: 1.1153673, 427.0: 1.1884971, 428.0: 1.2581233, 429.0: 1.3239296, 430.0: 1.3856, 431.0: 1.4426352, 432.0: 1.4948035, 433.0: 1.5421903, 434.0: 1.5848807, 435.0: 1.62296, 436.0: 1.6564048, 437.0: 1.6852959, 438.0: 1.7098745, 439.0: 1.7303821, 440.0: 1.74706, 441.0: 1.7600446, 442.0: 1.7696233, 443.0: 1.7762637, 444.0: 1.7804334, 445.0: 1.7826, 446.0: 1.7829682, 447.0: 1.7816998, 448.0: 1.7791982, 449.0: 1.7758671, 450.0: 1.77211, 451.0: 1.7682589, 452.0: 1.764039, 453.0: 1.7589438, 454.0: 1.7524663, 455.0: 1.7441, 456.0: 1.7335595, 457.0: 1.7208581, 458.0: 1.7059369, 459.0: 1.6887372, 460.0: 1.6692, 461.0: 1.6475287, 462.0: 1.6234127, 463.0: 1.5960223, 464.0: 1.564528, 465.0: 1.5281, 466.0: 1.4861114, 467.0: 1.4395215, 468.0: 1.3898799, 469.0: 1.3387362, 470.0: 1.28764, 471.0: 1.2374223, 472.0: 1.1878243, 473.0: 1.1387611, 474.0: 1.090148, 475.0: 1.0419, 476.0: 0.9941976, 477.0: 0.9473473, 478.0: 0.9014531, 479.0: 0.8566193, 480.0: 0.8129501, 481.0: 0.7705173, 482.0: 0.7294448, 483.0: 0.6899136, 484.0: 0.6521049, 485.0: 0.6162, 486.0: 0.5823286, 487.0: 0.5504162, 488.0: 0.5203376, 489.0: 0.4919673, 490.0: 0.46518, 491.0: 0.4399246, 492.0: 0.4161836, 493.0: 0.3938822, 494.0: 0.3729459, 495.0: 0.3533, 496.0: 0.3348578, 497.0: 0.3175521, 498.0: 0.3013375, 499.0: 0.2861686, 500.0: 0.272, 501.0: 0.2588171, 502.0: 0.2464838, 503.0: 0.2347718, 504.0: 0.2234533, 505.0: 0.2123, 506.0: 0.2011692, 507.0: 0.1901196, 508.0: 0.1792254, 509.0: 0.1685608, 510.0: 0.1582, 511.0: 0.1481383, 512.0: 0.1383758, 513.0: 0.1289942, 514.0: 0.1200751, 515.0: 0.1117, 516.0: 0.1039048, 517.0: 0.09666748, 518.0: 0.08998272, 519.0: 0.08384531, 520.0: 0.07824999, 521.0: 0.07320899, 522.0: 0.06867816, 523.0: 0.06456784, 524.0: 0.06078835, 525.0: 0.05725001, 526.0: 0.05390435, 527.0: 0.05074664, 528.0: 0.04775276, 529.0: 0.04489859, 530.0: 0.04216, 531.0: 0.03950728, 532.0: 0.03693564, 533.0: 0.03445836, 534.0: 0.03208872, 535.0: 0.02984, 536.0: 0.02771181, 537.0: 0.02569444, 538.0: 0.02378716, 539.0: 0.02198925, 540.0: 0.0203, 541.0: 0.01871805, 542.0: 0.01724036, 543.0: 0.01586364, 544.0: 0.01458461, 545.0: 0.0134, 546.0: 0.01230723, 547.0: 0.01130188, 548.0: 0.01037792, 549.0: 0.009529306, 550.0: 0.008749999, 551.0: 0.0080352, 552.0: 0.0073816, 553.0: 0.0067854, 554.0: 0.0062428, 555.0: 0.005749999, 556.0: 0.0053036, 557.0: 0.0048998, 558.0: 0.0045342, 559.0: 0.0042024, 560.0: 0.0039, 561.0: 0.0036232, 562.0: 0.0033706, 563.0: 0.0031414, 564.0: 0.0029348, 565.0: 0.002749999, 566.0: 0.0025852, 567.0: 0.0024386, 568.0: 0.0023094, 569.0: 0.0021968, 570.0: 0.0021, 571.0: 0.002017733, 572.0: 0.0019482, 573.0: 0.0018898, 574.0: 0.001840933, 575.0: 0.0018, 576.0: 0.001766267, 577.0: 0.0017378, 578.0: 0.0017112, 579.0: 0.001683067, 580.0: 0.001650001, 581.0: 0.001610133, 582.0: 0.0015644, 583.0: 0.0015136, 584.0: 0.001458533, 585.0: 0.0014, 586.0: 0.001336667, 587.0: 0.00127, 588.0: 0.001205, 589.0: 0.001146667, 590.0: 0.0011, 591.0: 0.0010688, 592.0: 0.0010494, 593.0: 0.0010356, 594.0: 0.0010212, 595.0: 0.001, 596.0: 0.00096864, 597.0: 0.00092992, 598.0: 0.00088688, 599.0: 0.00084256, 600.0: 0.0008, 601.0: 0.00076096, 602.0: 0.00072368, 603.0: 0.00068592, 604.0: 0.00064544, 605.0: 0.0006, 606.0: 0.0005478667, 607.0: 0.0004916, 608.0: 0.0004354, 609.0: 0.0003834667, 610.0: 0.00034, 611.0: 0.0003072533, 612.0: 0.00028316, 613.0: 0.00026544, 614.0: 0.0002518133, 615.0: 0.00024, 616.0: 0.0002295467, 617.0: 0.00022064, 618.0: 0.00021196, 619.0: 0.0002021867, 620.0: 0.00019, 621.0: 0.0001742133, 622.0: 0.00015564, 623.0: 0.00013596, 624.0: 0.0001168533, 625.0: 0.0001, 626.0: 8.613333e-05, 627.0: 7.46e-05, 628.0: 6.5e-05, 629.0: 5.693333e-05, 630.0: 4.999999e-05, 631.0: 4.416e-05, 632.0: 3.948e-05, 633.0: 3.572e-05, 634.0: 3.264e-05, 635.0: 3e-05, 636.0: 2.765333e-05, 637.0: 2.556e-05, 638.0: 2.364e-05, 639.0: 2.181333e-05, 640.0: 2e-05, 641.0: 1.813333e-05, 642.0: 1.62e-05, 643.0: 1.42e-05, 644.0: 1.213333e-05, 645.0: 1e-05, 646.0: 7.733333e-06, 647.0: 5.4e-06, 648.0: 3.2e-06, 649.0: 1.333333e-06, 650.0: 0.0, 651.0: 0.0, 652.0: 0.0, 653.0: 0.0, 654.0: 0.0, 655.0: 0.0, 656.0: 0.0, 657.0: 0.0, 658.0: 0.0, 659.0: 0.0, 660.0: 0.0, 661.0: 0.0, 662.0: 0.0, 663.0: 0.0, 664.0: 0.0, 665.0: 0.0, 666.0: 0.0, 667.0: 0.0, 668.0: 0.0, 669.0: 0.0, 670.0: 0.0, 671.0: 0.0, 672.0: 0.0, 673.0: 0.0, 674.0: 0.0, 675.0: 0.0, 676.0: 0.0, 677.0: 0.0, 678.0: 0.0, 679.0: 0.0, 680.0: 0.0, 681.0: 0.0, 682.0: 0.0, 683.0: 0.0, 684.0: 0.0, 685.0: 0.0, 686.0: 0.0, 687.0: 0.0, 688.0: 0.0, 689.0: 0.0, 690.0: 0.0, 691.0: 0.0, 692.0: 0.0, 693.0: 0.0, 694.0: 0.0, 695.0: 0.0, 696.0: 0.0, 697.0: 0.0, 698.0: 0.0, 699.0: 0.0, 700.0: 0.0, 701.0: 0.0, 702.0: 0.0, 703.0: 0.0, 704.0: 0.0, 705.0: 0.0, 706.0: 0.0, 707.0: 0.0, 708.0: 0.0, 709.0: 0.0, 710.0: 0.0, 711.0: 0.0, 712.0: 0.0, 713.0: 0.0, 714.0: 0.0, 715.0: 0.0, 716.0: 0.0, 717.0: 0.0, 718.0: 0.0, 719.0: 0.0, 720.0: 0.0, 721.0: 0.0, 722.0: 0.0, 723.0: 0.0, 724.0: 0.0, 725.0: 0.0, 726.0: 0.0, 727.0: 0.0, 728.0: 0.0, 729.0: 0.0, 730.0: 0.0, 731.0: 0.0, 732.0: 0.0, 733.0: 0.0, 734.0: 0.0, 735.0: 0.0, 736.0: 0.0, 737.0: 0.0, 738.0: 0.0, 739.0: 0.0, 740.0: 0.0, 741.0: 0.0, 742.0: 0.0, 743.0: 0.0, 744.0: 0.0, 745.0: 0.0, 746.0: 0.0, 747.0: 0.0, 748.0: 0.0, 749.0: 0.0, 750.0: 0.0, 751.0: 0.0, 752.0: 0.0, 753.0: 0.0, 754.0: 0.0, 755.0: 0.0, 756.0: 0.0, 757.0: 0.0, 758.0: 0.0, 759.0: 0.0, 760.0: 0.0, 761.0: 0.0, 762.0: 0.0, 763.0: 0.0, 764.0: 0.0, 765.0: 0.0, 766.0: 0.0, 767.0: 0.0, 768.0: 0.0, 769.0: 0.0, 770.0: 0.0, 771.0: 0.0, 772.0: 0.0, 773.0: 0.0, 774.0: 0.0, 775.0: 0.0, 776.0: 0.0, 777.0: 0.0, 778.0: 0.0, 779.0: 0.0, 780.0: 0.0, 781.0: 0.0, 782.0: 0.0, 783.0: 0.0, 784.0: 0.0, 785.0: 0.0, 786.0: 0.0, 787.0: 0.0, 788.0: 0.0, 789.0: 0.0, 790.0: 0.0, 791.0: 0.0, 792.0: 0.0, 793.0: 0.0, 794.0: 0.0, 795.0: 0.0, 796.0: 0.0, 797.0: 0.0, 798.0: 0.0, 799.0: 0.0, 800.0: 0.0, 801.0: 0.0, 802.0: 0.0, 803.0: 0.0, 804.0: 0.0, 805.0: 0.0, 806.0: 0.0, 807.0: 0.0, 808.0: 0.0, 809.0: 0.0, 810.0: 0.0, 811.0: 0.0, 812.0: 0.0, 813.0: 0.0, 814.0: 0.0, 815.0: 0.0, 816.0: 0.0, 817.0: 0.0, 818.0: 0.0, 819.0: 0.0, 820.0: 0.0, 821.0: 0.0, 822.0: 0.0, 823.0: 0.0, 824.0: 0.0, 825.0: 0.0, 826.0: 0.0, 827.0: 0.0, 828.0: 0.0, 829.0: 0.0, 830.0: 0.0}}, 'CIE 1931 2$^\circ$ Standard Observer'))[source]¶

Returns the complementary wavelength $\lambda_c$ for given colour stimulus $xy$ and the related $xy_wl$ first and $xy_{cw}$ second intersection coordinates with the spectral locus.

In the eventuality where the $xy_wl$ first intersection coordinates are on the line of purples, the dominant wavelength will be computed in lieu.

The dominant wavelength is indicated by a negative sign and the $xy_{cw}$ second intersection coordinates which are set by default to the same value than $xy_wl$ first intersection coordinates will be set to the dominant wavelength intersection coordinates with the spectral locus.

Parameters:	xy (array_like) – Colour stimulus xy chromaticity coordinates. xy_n (array_like) – Achromatic stimulus xy chromaticity coordinates. cmfs (XYZ_ColourMatchingFunctions, optional) – Standard observer colour matching functions.
Returns:	Complementary wavelength, first intersection point xy chromaticity coordinates, second intersection point xy chromaticity coordinates.
Return type:	tuple

See also

dominant_wavelength()

Examples

Complementary wavelength computation:

>>> from pprint import pprint
>>> xy = np.array([0.35000, 0.25000])
>>> xy_n = np.array([0.31270, 0.32900])
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> pprint(complementary_wavelength(xy, xy_n, cmfs))  
(array(520...),
 array([ 0.0743553...,  0.8338050...]),
 array([ 0.0743553...,  0.8338050...]))

Dominant wavelength is returned if the first intersection is located on the line of purples:

>>> xy = np.array([0.26415, 0.37770])
>>> pprint(complementary_wavelength(xy, xy_n, cmfs))  
(array(-504...),
 array([ 0.4897494...,  0.1514035...]),
 array([ 0.0036969...,  0.6389577...]))

colour.colorimetry.excitation_purity(xy, xy_n, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 403.0: 0.01878122, 404.0: 0.02074801, 405.0: 0.02319, 406.0: 0.02620736, 407.0: 0.02978248, 408.0: 0.03388092, 409.0: 0.03846824, 410.0: 0.04351, 411.0: 0.0489956, 412.0: 0.0550226, 413.0: 0.0617188, 414.0: 0.069212, 415.0: 0.07763, 416.0: 0.08695811, 417.0: 0.09717672, 418.0: 0.1084063, 419.0: 0.1207672, 420.0: 0.13438, 421.0: 0.1493582, 422.0: 0.1653957, 423.0: 0.1819831, 424.0: 0.198611, 425.0: 0.21477, 426.0: 0.2301868, 427.0: 0.2448797, 428.0: 0.2587773, 429.0: 0.2718079, 430.0: 0.2839, 431.0: 0.2949438, 432.0: 0.3048965, 433.0: 0.3137873, 434.0: 0.3216454, 435.0: 0.3285, 436.0: 0.3343513, 437.0: 0.3392101, 438.0: 0.3431213, 439.0: 0.3461296, 440.0: 0.34828, 441.0: 0.3495999, 442.0: 0.3501474, 443.0: 0.350013, 444.0: 0.349287, 445.0: 0.34806, 446.0: 0.3463733, 447.0: 0.3442624, 448.0: 0.3418088, 449.0: 0.3390941, 450.0: 0.3362, 451.0: 0.3331977, 452.0: 0.3300411, 453.0: 0.3266357, 454.0: 0.3228868, 455.0: 0.3187, 456.0: 0.3140251, 457.0: 0.308884, 458.0: 0.3032904, 459.0: 0.2972579, 460.0: 0.2908, 461.0: 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Returns the excitation purity $P_e$ for given colour stimulus $xy$.

Parameters:	xy (array_like) – Colour stimulus xy chromaticity coordinates. xy_n (array_like) – Achromatic stimulus xy chromaticity coordinates. cmfs (XYZ_ColourMatchingFunctions, optional) – Standard observer colour matching functions.
Returns:	Excitation purity $P_e$.
Return type:	numeric or array_like

Examples

>>> xy = np.array([0.28350, 0.68700])
>>> xy_n = np.array([0.31270, 0.32900])
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> excitation_purity(xy, xy_n, cmfs)  
0.9386035...

colour.colorimetry.colorimetric_purity(xy, xy_n, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 403.0: 0.01878122, 404.0: 0.02074801, 405.0: 0.02319, 406.0: 0.02620736, 407.0: 0.02978248, 408.0: 0.03388092, 409.0: 0.03846824, 410.0: 0.04351, 411.0: 0.0489956, 412.0: 0.0550226, 413.0: 0.0617188, 414.0: 0.069212, 415.0: 0.07763, 416.0: 0.08695811, 417.0: 0.09717672, 418.0: 0.1084063, 419.0: 0.1207672, 420.0: 0.13438, 421.0: 0.1493582, 422.0: 0.1653957, 423.0: 0.1819831, 424.0: 0.198611, 425.0: 0.21477, 426.0: 0.2301868, 427.0: 0.2448797, 428.0: 0.2587773, 429.0: 0.2718079, 430.0: 0.2839, 431.0: 0.2949438, 432.0: 0.3048965, 433.0: 0.3137873, 434.0: 0.3216454, 435.0: 0.3285, 436.0: 0.3343513, 437.0: 0.3392101, 438.0: 0.3431213, 439.0: 0.3461296, 440.0: 0.34828, 441.0: 0.3495999, 442.0: 0.3501474, 443.0: 0.350013, 444.0: 0.349287, 445.0: 0.34806, 446.0: 0.3463733, 447.0: 0.3442624, 448.0: 0.3418088, 449.0: 0.3390941, 450.0: 0.3362, 451.0: 0.3331977, 452.0: 0.3300411, 453.0: 0.3266357, 454.0: 0.3228868, 455.0: 0.3187, 456.0: 0.3140251, 457.0: 0.308884, 458.0: 0.3032904, 459.0: 0.2972579, 460.0: 0.2908, 461.0: 0.2839701, 462.0: 0.2767214, 463.0: 0.2689178, 464.0: 0.2604227, 465.0: 0.2511, 466.0: 0.2408475, 467.0: 0.2298512, 468.0: 0.2184072, 469.0: 0.2068115, 470.0: 0.19536, 471.0: 0.1842136, 472.0: 0.1733273, 473.0: 0.1626881, 474.0: 0.1522833, 475.0: 0.1421, 476.0: 0.1321786, 477.0: 0.1225696, 478.0: 0.1132752, 479.0: 0.1042979, 480.0: 0.09564, 481.0: 0.08729955, 482.0: 0.07930804, 483.0: 0.07171776, 484.0: 0.06458099, 485.0: 0.05795001, 486.0: 0.05186211, 487.0: 0.04628152, 488.0: 0.04115088, 489.0: 0.03641283, 490.0: 0.03201, 491.0: 0.0279172, 492.0: 0.0241444, 493.0: 0.020687, 494.0: 0.0175404, 495.0: 0.0147, 496.0: 0.01216179, 497.0: 0.00991996, 498.0: 0.00796724, 499.0: 0.006296346, 500.0: 0.0049, 501.0: 0.003777173, 502.0: 0.00294532, 503.0: 0.00242488, 504.0: 0.002236293, 505.0: 0.0024, 506.0: 0.00292552, 507.0: 0.00383656, 508.0: 0.00517484, 509.0: 0.00698208, 510.0: 0.0093, 511.0: 0.01214949, 512.0: 0.01553588, 513.0: 0.01947752, 514.0: 0.02399277, 515.0: 0.0291, 516.0: 0.03481485, 517.0: 0.04112016, 518.0: 0.04798504, 519.0: 0.05537861, 520.0: 0.06327, 521.0: 0.07163501, 522.0: 0.08046224, 523.0: 0.08973996, 524.0: 0.09945645, 525.0: 0.1096, 526.0: 0.1201674, 527.0: 0.1311145, 528.0: 0.1423679, 529.0: 0.1538542, 530.0: 0.1655, 531.0: 0.1772571, 532.0: 0.18914, 533.0: 0.2011694, 534.0: 0.2133658, 535.0: 0.2257499, 536.0: 0.2383209, 537.0: 0.2510668, 538.0: 0.2639922, 539.0: 0.2771017, 540.0: 0.2904, 541.0: 0.3038912, 542.0: 0.3175726, 543.0: 0.3314384, 544.0: 0.3454828, 545.0: 0.3597, 546.0: 0.3740839, 547.0: 0.3886396, 548.0: 0.4033784, 549.0: 0.4183115, 550.0: 0.4334499, 551.0: 0.4487953, 552.0: 0.464336, 553.0: 0.480064, 554.0: 0.4959713, 555.0: 0.5120501, 556.0: 0.5282959, 557.0: 0.5446916, 558.0: 0.5612094, 559.0: 0.5778215, 560.0: 0.5945, 561.0: 0.6112209, 562.0: 0.6279758, 563.0: 0.6447602, 564.0: 0.6615697, 565.0: 0.6784, 566.0: 0.6952392, 567.0: 0.7120586, 568.0: 0.7288284, 569.0: 0.7455188, 570.0: 0.7621, 571.0: 0.7785432, 572.0: 0.7948256, 573.0: 0.8109264, 574.0: 0.8268248, 575.0: 0.8425, 576.0: 0.8579325, 577.0: 0.8730816, 578.0: 0.8878944, 579.0: 0.9023181, 580.0: 0.9163, 581.0: 0.9297995, 582.0: 0.9427984, 583.0: 0.9552776, 584.0: 0.9672179, 585.0: 0.9786, 586.0: 0.9893856, 587.0: 0.9995488, 588.0: 1.0090892, 589.0: 1.0180064, 590.0: 1.0263, 591.0: 1.0339827, 592.0: 1.040986, 593.0: 1.047188, 594.0: 1.0524667, 595.0: 1.0567, 596.0: 1.0597944, 597.0: 1.0617992, 598.0: 1.0628068, 599.0: 1.0629096, 600.0: 1.0622, 601.0: 1.0607352, 602.0: 1.0584436, 603.0: 1.0552244, 604.0: 1.0509768, 605.0: 1.0456, 606.0: 1.0390369, 607.0: 1.0313608, 608.0: 1.0226662, 609.0: 1.0130477, 610.0: 1.0026, 611.0: 0.9913675, 612.0: 0.9793314, 613.0: 0.9664916, 614.0: 0.9528479, 615.0: 0.9384, 616.0: 0.923194, 617.0: 0.907244, 618.0: 0.890502, 619.0: 0.87292, 620.0: 0.8544499, 621.0: 0.835084, 622.0: 0.814946, 623.0: 0.794186, 624.0: 0.772954, 625.0: 0.7514, 626.0: 0.7295836, 627.0: 0.7075888, 628.0: 0.6856022, 629.0: 0.6638104, 630.0: 0.6424, 631.0: 0.6215149, 632.0: 0.6011138, 633.0: 0.5811052, 634.0: 0.5613977, 635.0: 0.5419, 636.0: 0.5225995, 637.0: 0.5035464, 638.0: 0.4847436, 639.0: 0.4661939, 640.0: 0.4479, 641.0: 0.4298613, 642.0: 0.412098, 643.0: 0.394644, 644.0: 0.3775333, 645.0: 0.3608, 646.0: 0.3444563, 647.0: 0.3285168, 648.0: 0.3130192, 649.0: 0.2980011, 650.0: 0.2835, 651.0: 0.2695448, 652.0: 0.2561184, 653.0: 0.2431896, 654.0: 0.2307272, 655.0: 0.2187, 656.0: 0.2070971, 657.0: 0.1959232, 658.0: 0.1851708, 659.0: 0.1748323, 660.0: 0.1649, 661.0: 0.1553667, 662.0: 0.14623, 663.0: 0.13749, 664.0: 0.1291467, 665.0: 0.1212, 666.0: 0.1136397, 667.0: 0.106465, 668.0: 0.09969044, 669.0: 0.09333061, 670.0: 0.0874, 671.0: 0.08190096, 672.0: 0.07680428, 673.0: 0.07207712, 674.0: 0.06768664, 675.0: 0.0636, 676.0: 0.05980685, 677.0: 0.05628216, 678.0: 0.05297104, 679.0: 0.04981861, 680.0: 0.04677, 681.0: 0.04378405, 682.0: 0.04087536, 683.0: 0.03807264, 684.0: 0.03540461, 685.0: 0.0329, 686.0: 0.03056419, 687.0: 0.02838056, 688.0: 0.02634484, 689.0: 0.02445275, 690.0: 0.0227, 691.0: 0.02108429, 692.0: 0.01959988, 693.0: 0.01823732, 694.0: 0.01698717, 695.0: 0.01584, 696.0: 0.01479064, 697.0: 0.01383132, 698.0: 0.01294868, 699.0: 0.0121292, 700.0: 0.01135916, 701.0: 0.01062935, 702.0: 0.009938846, 703.0: 0.009288422, 704.0: 0.008678854, 705.0: 0.008110916, 706.0: 0.007582388, 707.0: 0.007088746, 708.0: 0.006627313, 709.0: 0.006195408, 710.0: 0.005790346, 711.0: 0.005409826, 712.0: 0.005052583, 713.0: 0.004717512, 714.0: 0.004403507, 715.0: 0.004109457, 716.0: 0.003833913, 717.0: 0.003575748, 718.0: 0.003334342, 719.0: 0.003109075, 720.0: 0.002899327, 721.0: 0.002704348, 722.0: 0.00252302, 723.0: 0.002354168, 724.0: 0.002196616, 725.0: 0.00204919, 726.0: 0.00191096, 727.0: 0.001781438, 728.0: 0.00166011, 729.0: 0.001546459, 730.0: 0.001439971, 731.0: 0.001340042, 732.0: 0.001246275, 733.0: 0.001158471, 734.0: 0.00107643, 735.0: 0.0009999493, 736.0: 0.0009287358, 737.0: 0.0008624332, 738.0: 0.0008007503, 739.0: 0.000743396, 740.0: 0.0006900786, 741.0: 0.0006405156, 742.0: 0.0005945021, 743.0: 0.0005518646, 744.0: 0.000512429, 745.0: 0.0004760213, 746.0: 0.0004424536, 747.0: 0.0004115117, 748.0: 0.0003829814, 749.0: 0.0003566491, 750.0: 0.0003323011, 751.0: 0.0003097586, 752.0: 0.0002888871, 753.0: 0.0002695394, 754.0: 0.0002515682, 755.0: 0.0002348261, 756.0: 0.000219171, 757.0: 0.0002045258, 758.0: 0.0001908405, 759.0: 0.0001780654, 760.0: 0.0001661505, 761.0: 0.0001550236, 762.0: 0.0001446219, 763.0: 0.0001349098, 764.0: 0.000125852, 765.0: 0.000117413, 766.0: 0.0001095515, 767.0: 0.0001022245, 768.0: 9.539445e-05, 769.0: 8.90239e-05, 770.0: 8.307527e-05, 771.0: 7.751269e-05, 772.0: 7.231304e-05, 773.0: 6.745778e-05, 774.0: 6.292844e-05, 775.0: 5.870652e-05, 776.0: 5.477028e-05, 777.0: 5.109918e-05, 778.0: 4.767654e-05, 779.0: 4.448567e-05, 780.0: 4.150994e-05, 781.0: 3.873324e-05, 782.0: 3.614203e-05, 783.0: 3.372352e-05, 784.0: 3.146487e-05, 785.0: 2.935326e-05, 786.0: 2.737573e-05, 787.0: 2.552433e-05, 788.0: 2.379376e-05, 789.0: 2.21787e-05, 790.0: 2.067383e-05, 791.0: 1.927226e-05, 792.0: 1.79664e-05, 793.0: 1.674991e-05, 794.0: 1.561648e-05, 795.0: 1.455977e-05, 796.0: 1.357387e-05, 797.0: 1.265436e-05, 798.0: 1.179723e-05, 799.0: 1.099844e-05, 800.0: 1.025398e-05, 801.0: 9.559646e-06, 802.0: 8.912044e-06, 803.0: 8.308358e-06, 804.0: 7.745769e-06, 805.0: 7.221456e-06, 806.0: 6.732475e-06, 807.0: 6.276423e-06, 808.0: 5.851304e-06, 809.0: 5.455118e-06, 810.0: 5.085868e-06, 811.0: 4.741466e-06, 812.0: 4.420236e-06, 813.0: 4.120783e-06, 814.0: 3.841716e-06, 815.0: 3.581652e-06, 816.0: 3.339127e-06, 817.0: 3.112949e-06, 818.0: 2.902121e-06, 819.0: 2.705645e-06, 820.0: 2.522525e-06, 821.0: 2.351726e-06, 822.0: 2.192415e-06, 823.0: 2.043902e-06, 824.0: 1.905497e-06, 825.0: 1.776509e-06, 826.0: 1.656215e-06, 827.0: 1.544022e-06, 828.0: 1.43944e-06, 829.0: 1.341977e-06, 830.0: 1.251141e-06}, u'y_bar': {360.0: 3.917e-06, 361.0: 4.393581e-06, 362.0: 4.929604e-06, 363.0: 5.532136e-06, 364.0: 6.208245e-06, 365.0: 6.965e-06, 366.0: 7.813219e-06, 367.0: 8.767336e-06, 368.0: 9.839844e-06, 369.0: 1.104323e-05, 370.0: 1.239e-05, 371.0: 1.388641e-05, 372.0: 1.555728e-05, 373.0: 1.744296e-05, 374.0: 1.958375e-05, 375.0: 2.202e-05, 376.0: 2.483965e-05, 377.0: 2.804126e-05, 378.0: 3.153104e-05, 379.0: 3.521521e-05, 380.0: 3.9e-05, 381.0: 4.28264e-05, 382.0: 4.69146e-05, 383.0: 5.15896e-05, 384.0: 5.71764e-05, 385.0: 6.4e-05, 386.0: 7.234421e-05, 387.0: 8.221224e-05, 388.0: 9.350816e-05, 389.0: 0.0001061361, 390.0: 0.00012, 391.0: 0.000134984, 392.0: 0.000151492, 393.0: 0.000170208, 394.0: 0.000191816, 395.0: 0.000217, 396.0: 0.0002469067, 397.0: 0.00028124, 398.0: 0.00031852, 399.0: 0.0003572667, 400.0: 0.000396, 401.0: 0.0004337147, 402.0: 0.000473024, 403.0: 0.000517876, 404.0: 0.0005722187, 405.0: 0.00064, 406.0: 0.00072456, 407.0: 0.0008255, 408.0: 0.00094116, 409.0: 0.00106988, 410.0: 0.00121, 411.0: 0.001362091, 412.0: 0.001530752, 413.0: 0.001720368, 414.0: 0.001935323, 415.0: 0.00218, 416.0: 0.0024548, 417.0: 0.002764, 418.0: 0.0031178, 419.0: 0.0035264, 420.0: 0.004, 421.0: 0.00454624, 422.0: 0.00515932, 423.0: 0.00582928, 424.0: 0.00654616, 425.0: 0.0073, 426.0: 0.008086507, 427.0: 0.00890872, 428.0: 0.00976768, 429.0: 0.01066443, 430.0: 0.0116, 431.0: 0.01257317, 432.0: 0.01358272, 433.0: 0.01462968, 434.0: 0.01571509, 435.0: 0.01684, 436.0: 0.01800736, 437.0: 0.01921448, 438.0: 0.02045392, 439.0: 0.02171824, 440.0: 0.023, 441.0: 0.02429461, 442.0: 0.02561024, 443.0: 0.02695857, 444.0: 0.02835125, 445.0: 0.0298, 446.0: 0.03131083, 447.0: 0.03288368, 448.0: 0.03452112, 449.0: 0.03622571, 450.0: 0.038, 451.0: 0.03984667, 452.0: 0.041768, 453.0: 0.043766, 454.0: 0.04584267, 455.0: 0.048, 456.0: 0.05024368, 457.0: 0.05257304, 458.0: 0.05498056, 459.0: 0.05745872, 460.0: 0.06, 461.0: 0.06260197, 462.0: 0.06527752, 463.0: 0.06804208, 464.0: 0.07091109, 465.0: 0.0739, 466.0: 0.077016, 467.0: 0.0802664, 468.0: 0.0836668, 469.0: 0.0872328, 470.0: 0.09098, 471.0: 0.09491755, 472.0: 0.09904584, 473.0: 0.1033674, 474.0: 0.1078846, 475.0: 0.1126, 476.0: 0.117532, 477.0: 0.1226744, 478.0: 0.1279928, 479.0: 0.1334528, 480.0: 0.13902, 481.0: 0.1446764, 482.0: 0.1504693, 483.0: 0.1564619, 484.0: 0.1627177, 485.0: 0.1693, 486.0: 0.1762431, 487.0: 0.1835581, 488.0: 0.1912735, 489.0: 0.199418, 490.0: 0.20802, 491.0: 0.2171199, 492.0: 0.2267345, 493.0: 0.2368571, 494.0: 0.2474812, 495.0: 0.2586, 496.0: 0.2701849, 497.0: 0.2822939, 498.0: 0.2950505, 499.0: 0.308578, 500.0: 0.323, 501.0: 0.3384021, 502.0: 0.3546858, 503.0: 0.3716986, 504.0: 0.3892875, 505.0: 0.4073, 506.0: 0.4256299, 507.0: 0.4443096, 508.0: 0.4633944, 509.0: 0.4829395, 510.0: 0.503, 511.0: 0.5235693, 512.0: 0.544512, 513.0: 0.56569, 514.0: 0.5869653, 515.0: 0.6082, 516.0: 0.6293456, 517.0: 0.6503068, 518.0: 0.6708752, 519.0: 0.6908424, 520.0: 0.71, 521.0: 0.7281852, 522.0: 0.7454636, 523.0: 0.7619694, 524.0: 0.7778368, 525.0: 0.7932, 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Returns the colorimetric purity $P_c$ for given colour stimulus $xy$.

Parameters:	xy (array_like) – Colour stimulus xy chromaticity coordinates. xy_n (array_like) – Achromatic stimulus xy chromaticity coordinates. cmfs (XYZ_ColourMatchingFunctions, optional) – Standard observer colour matching functions.
Returns:	Colorimetric purity $P_c$.
Return type:	numeric or array_like

Examples

>>> xy = np.array([0.28350, 0.68700])
>>> xy_n = np.array([0.31270, 0.32900])
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> colorimetric_purity(xy, xy_n, cmfs)  
0.9705976...

colour.colorimetry.luminous_flux(spd, lef=SpectralPowerDistribution( 'CIE 1924 Photopic Standard Observer', {360.0: 3.917e-06, 361.0: 4.393581e-06, 362.0: 4.929604e-06, 363.0: 5.532136e-06, 364.0: 6.208245e-06, 365.0: 6.965e-06, 366.0: 7.813219e-06, 367.0: 8.767336e-06, 368.0: 9.839844e-06, 369.0: 1.104323e-05, 370.0: 1.239e-05, 371.0: 1.388641e-05, 372.0: 1.555728e-05, 373.0: 1.744296e-05, 374.0: 1.958375e-05, 375.0: 2.202e-05, 376.0: 2.483965e-05, 377.0: 2.804126e-05, 378.0: 3.153104e-05, 379.0: 3.521521e-05, 380.0: 3.9e-05, 381.0: 4.28264e-05, 382.0: 4.69146e-05, 383.0: 5.15896e-05, 384.0: 5.71764e-05, 385.0: 6.4e-05, 386.0: 7.234421e-05, 387.0: 8.221224e-05, 388.0: 9.350816e-05, 389.0: 0.0001061361, 390.0: 0.00012, 391.0: 0.000134984, 392.0: 0.000151492, 393.0: 0.000170208, 394.0: 0.000191816, 395.0: 0.000217, 396.0: 0.0002469067, 397.0: 0.00028124, 398.0: 0.00031852, 399.0: 0.0003572667, 400.0: 0.000396, 401.0: 0.0004337147, 402.0: 0.000473024, 403.0: 0.000517876, 404.0: 0.0005722187, 405.0: 0.00064, 406.0: 0.00072456, 407.0: 0.0008255, 408.0: 0.00094116, 409.0: 0.00106988, 410.0: 0.00121, 411.0: 0.001362091, 412.0: 0.001530752, 413.0: 0.001720368, 414.0: 0.001935323, 415.0: 0.00218, 416.0: 0.0024548, 417.0: 0.002764, 418.0: 0.0031178, 419.0: 0.0035264, 420.0: 0.004, 421.0: 0.00454624, 422.0: 0.00515932, 423.0: 0.00582928, 424.0: 0.00654616, 425.0: 0.0073, 426.0: 0.008086507, 427.0: 0.00890872, 428.0: 0.00976768, 429.0: 0.01066443, 430.0: 0.0116, 431.0: 0.01257317, 432.0: 0.01358272, 433.0: 0.01462968, 434.0: 0.01571509, 435.0: 0.01684, 436.0: 0.01800736, 437.0: 0.01921448, 438.0: 0.02045392, 439.0: 0.02171824, 440.0: 0.023, 441.0: 0.02429461, 442.0: 0.02561024, 443.0: 0.02695857, 444.0: 0.02835125, 445.0: 0.0298, 446.0: 0.03131083, 447.0: 0.03288368, 448.0: 0.03452112, 449.0: 0.03622571, 450.0: 0.038, 451.0: 0.03984667, 452.0: 0.041768, 453.0: 0.043766, 454.0: 0.04584267, 455.0: 0.048, 456.0: 0.05024368, 457.0: 0.05257304, 458.0: 0.05498056, 459.0: 0.05745872, 460.0: 0.06, 461.0: 0.06260197, 462.0: 0.06527752, 463.0: 0.06804208, 464.0: 0.07091109, 465.0: 0.0739, 466.0: 0.077016, 467.0: 0.0802664, 468.0: 0.0836668, 469.0: 0.0872328, 470.0: 0.09098, 471.0: 0.09491755, 472.0: 0.09904584, 473.0: 0.1033674, 474.0: 0.1078846, 475.0: 0.1126, 476.0: 0.117532, 477.0: 0.1226744, 478.0: 0.1279928, 479.0: 0.1334528, 480.0: 0.13902, 481.0: 0.1446764, 482.0: 0.1504693, 483.0: 0.1564619, 484.0: 0.1627177, 485.0: 0.1693, 486.0: 0.1762431, 487.0: 0.1835581, 488.0: 0.1912735, 489.0: 0.199418, 490.0: 0.20802, 491.0: 0.2171199, 492.0: 0.2267345, 493.0: 0.2368571, 494.0: 0.2474812, 495.0: 0.2586, 496.0: 0.2701849, 497.0: 0.2822939, 498.0: 0.2950505, 499.0: 0.308578, 500.0: 0.323, 501.0: 0.3384021, 502.0: 0.3546858, 503.0: 0.3716986, 504.0: 0.3892875, 505.0: 0.4073, 506.0: 0.4256299, 507.0: 0.4443096, 508.0: 0.4633944, 509.0: 0.4829395, 510.0: 0.503, 511.0: 0.5235693, 512.0: 0.544512, 513.0: 0.56569, 514.0: 0.5869653, 515.0: 0.6082, 516.0: 0.6293456, 517.0: 0.6503068, 518.0: 0.6708752, 519.0: 0.6908424, 520.0: 0.71, 521.0: 0.7281852, 522.0: 0.7454636, 523.0: 0.7619694, 524.0: 0.7778368, 525.0: 0.7932, 526.0: 0.8081104, 527.0: 0.8224962, 528.0: 0.8363068, 529.0: 0.8494916, 530.0: 0.862, 531.0: 0.8738108, 532.0: 0.8849624, 533.0: 0.8954936, 534.0: 0.9054432, 535.0: 0.9148501, 536.0: 0.9237348, 537.0: 0.9320924, 538.0: 0.9399226, 539.0: 0.9472252, 540.0: 0.954, 541.0: 0.9602561, 542.0: 0.9660074, 543.0: 0.9712606, 544.0: 0.9760225, 545.0: 0.9803, 546.0: 0.9840924, 547.0: 0.9874182, 548.0: 0.9903128, 549.0: 0.9928116, 550.0: 0.9949501, 551.0: 0.9967108, 552.0: 0.9980983, 553.0: 0.999112, 554.0: 0.9997482, 555.0: 1.0, 556.0: 0.9998567, 557.0: 0.9993046, 558.0: 0.9983255, 559.0: 0.9968987, 560.0: 0.995, 561.0: 0.9926005, 562.0: 0.9897426, 563.0: 0.9864444, 564.0: 0.9827241, 565.0: 0.9786, 566.0: 0.9740837, 567.0: 0.9691712, 568.0: 0.9638568, 569.0: 0.9581349, 570.0: 0.952, 571.0: 0.9454504, 572.0: 0.9384992, 573.0: 0.9311628, 574.0: 0.9234576, 575.0: 0.9154, 576.0: 0.9070064, 577.0: 0.8982772, 578.0: 0.8892048, 579.0: 0.8797816, 580.0: 0.87, 581.0: 0.8598613, 582.0: 0.849392, 583.0: 0.838622, 584.0: 0.8275813, 585.0: 0.8163, 586.0: 0.8047947, 587.0: 0.793082, 588.0: 0.781192, 589.0: 0.7691547, 590.0: 0.757, 591.0: 0.7447541, 592.0: 0.7324224, 593.0: 0.7200036, 594.0: 0.7074965, 595.0: 0.6949, 596.0: 0.6822192, 597.0: 0.6694716, 598.0: 0.6566744, 599.0: 0.6438448, 600.0: 0.631, 601.0: 0.6181555, 602.0: 0.6053144, 603.0: 0.5924756, 604.0: 0.5796379, 605.0: 0.5668, 606.0: 0.5539611, 607.0: 0.5411372, 608.0: 0.5283528, 609.0: 0.5156323, 610.0: 0.503, 611.0: 0.4904688, 612.0: 0.4780304, 613.0: 0.4656776, 614.0: 0.4534032, 615.0: 0.4412, 616.0: 0.42908, 617.0: 0.417036, 618.0: 0.405032, 619.0: 0.393032, 620.0: 0.381, 621.0: 0.3689184, 622.0: 0.3568272, 623.0: 0.3447768, 624.0: 0.3328176, 625.0: 0.321, 626.0: 0.3093381, 627.0: 0.2978504, 628.0: 0.2865936, 629.0: 0.2756245, 630.0: 0.265, 631.0: 0.2547632, 632.0: 0.2448896, 633.0: 0.2353344, 634.0: 0.2260528, 635.0: 0.217, 636.0: 0.2081616, 637.0: 0.1995488, 638.0: 0.1911552, 639.0: 0.1829744, 640.0: 0.175, 641.0: 0.1672235, 642.0: 0.1596464, 643.0: 0.1522776, 644.0: 0.1451259, 645.0: 0.1382, 646.0: 0.1315003, 647.0: 0.1250248, 648.0: 0.1187792, 649.0: 0.1127691, 650.0: 0.107, 651.0: 0.1014762, 652.0: 0.09618864, 653.0: 0.09112296, 654.0: 0.08626485, 655.0: 0.0816, 656.0: 0.07712064, 657.0: 0.07282552, 658.0: 0.06871008, 659.0: 0.06476976, 660.0: 0.061, 661.0: 0.05739621, 662.0: 0.05395504, 663.0: 0.05067376, 664.0: 0.04754965, 665.0: 0.04458, 666.0: 0.04175872, 667.0: 0.03908496, 668.0: 0.03656384, 669.0: 0.03420048, 670.0: 0.032, 671.0: 0.02996261, 672.0: 0.02807664, 673.0: 0.02632936, 674.0: 0.02470805, 675.0: 0.0232, 676.0: 0.02180077, 677.0: 0.02050112, 678.0: 0.01928108, 679.0: 0.01812069, 680.0: 0.017, 681.0: 0.01590379, 682.0: 0.01483718, 683.0: 0.01381068, 684.0: 0.01283478, 685.0: 0.01192, 686.0: 0.01106831, 687.0: 0.01027339, 688.0: 0.009533311, 689.0: 0.008846157, 690.0: 0.00821, 691.0: 0.007623781, 692.0: 0.007085424, 693.0: 0.006591476, 694.0: 0.006138485, 695.0: 0.005723, 696.0: 0.005343059, 697.0: 0.004995796, 698.0: 0.004676404, 699.0: 0.004380075, 700.0: 0.004102, 701.0: 0.003838453, 702.0: 0.003589099, 703.0: 0.003354219, 704.0: 0.003134093, 705.0: 0.002929, 706.0: 0.002738139, 707.0: 0.002559876, 708.0: 0.002393244, 709.0: 0.002237275, 710.0: 0.002091, 711.0: 0.001953587, 712.0: 0.00182458, 713.0: 0.00170358, 714.0: 0.001590187, 715.0: 0.001484, 716.0: 0.001384496, 717.0: 0.001291268, 718.0: 0.001204092, 719.0: 0.001122744, 720.0: 0.001047, 721.0: 0.0009765896, 722.0: 0.0009111088, 723.0: 0.0008501332, 724.0: 0.0007932384, 725.0: 0.00074, 726.0: 0.0006900827, 727.0: 0.00064331, 728.0: 0.000599496, 729.0: 0.0005584547, 730.0: 0.00052, 731.0: 0.0004839136, 732.0: 0.0004500528, 733.0: 0.0004183452, 734.0: 0.0003887184, 735.0: 0.0003611, 736.0: 0.0003353835, 737.0: 0.0003114404, 738.0: 0.0002891656, 739.0: 0.0002684539, 740.0: 0.0002492, 741.0: 0.0002313019, 742.0: 0.0002146856, 743.0: 0.0001992884, 744.0: 0.0001850475, 745.0: 0.0001719, 746.0: 0.0001597781, 747.0: 0.0001486044, 748.0: 0.0001383016, 749.0: 0.0001287925, 750.0: 0.00012, 751.0: 0.0001118595, 752.0: 0.0001043224, 753.0: 9.73356e-05, 754.0: 9.084587e-05, 755.0: 8.48e-05, 756.0: 7.914667e-05, 757.0: 7.3858e-05, 758.0: 6.8916e-05, 759.0: 6.430267e-05, 760.0: 6e-05, 761.0: 5.598187e-05, 762.0: 5.22256e-05, 763.0: 4.87184e-05, 764.0: 4.544747e-05, 765.0: 4.24e-05, 766.0: 3.956104e-05, 767.0: 3.691512e-05, 768.0: 3.444868e-05, 769.0: 3.214816e-05, 770.0: 3e-05, 771.0: 2.799125e-05, 772.0: 2.611356e-05, 773.0: 2.436024e-05, 774.0: 2.272461e-05, 775.0: 2.12e-05, 776.0: 1.977855e-05, 777.0: 1.845285e-05, 778.0: 1.721687e-05, 779.0: 1.606459e-05, 780.0: 1.499e-05, 781.0: 1.398728e-05, 782.0: 1.305155e-05, 783.0: 1.217818e-05, 784.0: 1.136254e-05, 785.0: 1.06e-05, 786.0: 9.885877e-06, 787.0: 9.217304e-06, 788.0: 8.592362e-06, 789.0: 8.009133e-06, 790.0: 7.4657e-06, 791.0: 6.959567e-06, 792.0: 6.487995e-06, 793.0: 6.048699e-06, 794.0: 5.639396e-06, 795.0: 5.2578e-06, 796.0: 4.901771e-06, 797.0: 4.56972e-06, 798.0: 4.260194e-06, 799.0: 3.971739e-06, 800.0: 3.7029e-06, 801.0: 3.452163e-06, 802.0: 3.218302e-06, 803.0: 3.0003e-06, 804.0: 2.797139e-06, 805.0: 2.6078e-06, 806.0: 2.43122e-06, 807.0: 2.266531e-06, 808.0: 2.113013e-06, 809.0: 1.969943e-06, 810.0: 1.8366e-06, 811.0: 1.71223e-06, 812.0: 1.596228e-06, 813.0: 1.48809e-06, 814.0: 1.387314e-06, 815.0: 1.2934e-06, 816.0: 1.20582e-06, 817.0: 1.124143e-06, 818.0: 1.048009e-06, 819.0: 9.770578e-07, 820.0: 9.1093e-07, 821.0: 8.492513e-07, 822.0: 7.917212e-07, 823.0: 7.380904e-07, 824.0: 6.881098e-07, 825.0: 6.4153e-07, 826.0: 5.980895e-07, 827.0: 5.575746e-07, 828.0: 5.19808e-07, 829.0: 4.846123e-07, 830.0: 4.5181e-07}), K_m=683)[source]¶

Returns the luminous flux for given spectral power distribution using given luminous efficiency function.

Parameters:	spd (SpectralPowerDistribution) – test spectral power distribution lef (SpectralPowerDistribution, optional) – $V(\lambda)$ luminous efficiency function. K_m (numeric, optional) – $lm\cdot W^{-1}$ maximum photopic luminous efficiency
Returns:	Luminous flux.
Return type:	numeric

Examples

>>> from colour import LIGHT_SOURCES_RELATIVE_SPDS
>>> spd = LIGHT_SOURCES_RELATIVE_SPDS['Neodimium Incandescent']
>>> luminous_flux(spd)  
23807.6555273...

colour.colorimetry.luminous_efficiency(spd, lef=SpectralPowerDistribution( 'CIE 1924 Photopic Standard Observer', {360.0: 3.917e-06, 361.0: 4.393581e-06, 362.0: 4.929604e-06, 363.0: 5.532136e-06, 364.0: 6.208245e-06, 365.0: 6.965e-06, 366.0: 7.813219e-06, 367.0: 8.767336e-06, 368.0: 9.839844e-06, 369.0: 1.104323e-05, 370.0: 1.239e-05, 371.0: 1.388641e-05, 372.0: 1.555728e-05, 373.0: 1.744296e-05, 374.0: 1.958375e-05, 375.0: 2.202e-05, 376.0: 2.483965e-05, 377.0: 2.804126e-05, 378.0: 3.153104e-05, 379.0: 3.521521e-05, 380.0: 3.9e-05, 381.0: 4.28264e-05, 382.0: 4.69146e-05, 383.0: 5.15896e-05, 384.0: 5.71764e-05, 385.0: 6.4e-05, 386.0: 7.234421e-05, 387.0: 8.221224e-05, 388.0: 9.350816e-05, 389.0: 0.0001061361, 390.0: 0.00012, 391.0: 0.000134984, 392.0: 0.000151492, 393.0: 0.000170208, 394.0: 0.000191816, 395.0: 0.000217, 396.0: 0.0002469067, 397.0: 0.00028124, 398.0: 0.00031852, 399.0: 0.0003572667, 400.0: 0.000396, 401.0: 0.0004337147, 402.0: 0.000473024, 403.0: 0.000517876, 404.0: 0.0005722187, 405.0: 0.00064, 406.0: 0.00072456, 407.0: 0.0008255, 408.0: 0.00094116, 409.0: 0.00106988, 410.0: 0.00121, 411.0: 0.001362091, 412.0: 0.001530752, 413.0: 0.001720368, 414.0: 0.001935323, 415.0: 0.00218, 416.0: 0.0024548, 417.0: 0.002764, 418.0: 0.0031178, 419.0: 0.0035264, 420.0: 0.004, 421.0: 0.00454624, 422.0: 0.00515932, 423.0: 0.00582928, 424.0: 0.00654616, 425.0: 0.0073, 426.0: 0.008086507, 427.0: 0.00890872, 428.0: 0.00976768, 429.0: 0.01066443, 430.0: 0.0116, 431.0: 0.01257317, 432.0: 0.01358272, 433.0: 0.01462968, 434.0: 0.01571509, 435.0: 0.01684, 436.0: 0.01800736, 437.0: 0.01921448, 438.0: 0.02045392, 439.0: 0.02171824, 440.0: 0.023, 441.0: 0.02429461, 442.0: 0.02561024, 443.0: 0.02695857, 444.0: 0.02835125, 445.0: 0.0298, 446.0: 0.03131083, 447.0: 0.03288368, 448.0: 0.03452112, 449.0: 0.03622571, 450.0: 0.038, 451.0: 0.03984667, 452.0: 0.041768, 453.0: 0.043766, 454.0: 0.04584267, 455.0: 0.048, 456.0: 0.05024368, 457.0: 0.05257304, 458.0: 0.05498056, 459.0: 0.05745872, 460.0: 0.06, 461.0: 0.06260197, 462.0: 0.06527752, 463.0: 0.06804208, 464.0: 0.07091109, 465.0: 0.0739, 466.0: 0.077016, 467.0: 0.0802664, 468.0: 0.0836668, 469.0: 0.0872328, 470.0: 0.09098, 471.0: 0.09491755, 472.0: 0.09904584, 473.0: 0.1033674, 474.0: 0.1078846, 475.0: 0.1126, 476.0: 0.117532, 477.0: 0.1226744, 478.0: 0.1279928, 479.0: 0.1334528, 480.0: 0.13902, 481.0: 0.1446764, 482.0: 0.1504693, 483.0: 0.1564619, 484.0: 0.1627177, 485.0: 0.1693, 486.0: 0.1762431, 487.0: 0.1835581, 488.0: 0.1912735, 489.0: 0.199418, 490.0: 0.20802, 491.0: 0.2171199, 492.0: 0.2267345, 493.0: 0.2368571, 494.0: 0.2474812, 495.0: 0.2586, 496.0: 0.2701849, 497.0: 0.2822939, 498.0: 0.2950505, 499.0: 0.308578, 500.0: 0.323, 501.0: 0.3384021, 502.0: 0.3546858, 503.0: 0.3716986, 504.0: 0.3892875, 505.0: 0.4073, 506.0: 0.4256299, 507.0: 0.4443096, 508.0: 0.4633944, 509.0: 0.4829395, 510.0: 0.503, 511.0: 0.5235693, 512.0: 0.544512, 513.0: 0.56569, 514.0: 0.5869653, 515.0: 0.6082, 516.0: 0.6293456, 517.0: 0.6503068, 518.0: 0.6708752, 519.0: 0.6908424, 520.0: 0.71, 521.0: 0.7281852, 522.0: 0.7454636, 523.0: 0.7619694, 524.0: 0.7778368, 525.0: 0.7932, 526.0: 0.8081104, 527.0: 0.8224962, 528.0: 0.8363068, 529.0: 0.8494916, 530.0: 0.862, 531.0: 0.8738108, 532.0: 0.8849624, 533.0: 0.8954936, 534.0: 0.9054432, 535.0: 0.9148501, 536.0: 0.9237348, 537.0: 0.9320924, 538.0: 0.9399226, 539.0: 0.9472252, 540.0: 0.954, 541.0: 0.9602561, 542.0: 0.9660074, 543.0: 0.9712606, 544.0: 0.9760225, 545.0: 0.9803, 546.0: 0.9840924, 547.0: 0.9874182, 548.0: 0.9903128, 549.0: 0.9928116, 550.0: 0.9949501, 551.0: 0.9967108, 552.0: 0.9980983, 553.0: 0.999112, 554.0: 0.9997482, 555.0: 1.0, 556.0: 0.9998567, 557.0: 0.9993046, 558.0: 0.9983255, 559.0: 0.9968987, 560.0: 0.995, 561.0: 0.9926005, 562.0: 0.9897426, 563.0: 0.9864444, 564.0: 0.9827241, 565.0: 0.9786, 566.0: 0.9740837, 567.0: 0.9691712, 568.0: 0.9638568, 569.0: 0.9581349, 570.0: 0.952, 571.0: 0.9454504, 572.0: 0.9384992, 573.0: 0.9311628, 574.0: 0.9234576, 575.0: 0.9154, 576.0: 0.9070064, 577.0: 0.8982772, 578.0: 0.8892048, 579.0: 0.8797816, 580.0: 0.87, 581.0: 0.8598613, 582.0: 0.849392, 583.0: 0.838622, 584.0: 0.8275813, 585.0: 0.8163, 586.0: 0.8047947, 587.0: 0.793082, 588.0: 0.781192, 589.0: 0.7691547, 590.0: 0.757, 591.0: 0.7447541, 592.0: 0.7324224, 593.0: 0.7200036, 594.0: 0.7074965, 595.0: 0.6949, 596.0: 0.6822192, 597.0: 0.6694716, 598.0: 0.6566744, 599.0: 0.6438448, 600.0: 0.631, 601.0: 0.6181555, 602.0: 0.6053144, 603.0: 0.5924756, 604.0: 0.5796379, 605.0: 0.5668, 606.0: 0.5539611, 607.0: 0.5411372, 608.0: 0.5283528, 609.0: 0.5156323, 610.0: 0.503, 611.0: 0.4904688, 612.0: 0.4780304, 613.0: 0.4656776, 614.0: 0.4534032, 615.0: 0.4412, 616.0: 0.42908, 617.0: 0.417036, 618.0: 0.405032, 619.0: 0.393032, 620.0: 0.381, 621.0: 0.3689184, 622.0: 0.3568272, 623.0: 0.3447768, 624.0: 0.3328176, 625.0: 0.321, 626.0: 0.3093381, 627.0: 0.2978504, 628.0: 0.2865936, 629.0: 0.2756245, 630.0: 0.265, 631.0: 0.2547632, 632.0: 0.2448896, 633.0: 0.2353344, 634.0: 0.2260528, 635.0: 0.217, 636.0: 0.2081616, 637.0: 0.1995488, 638.0: 0.1911552, 639.0: 0.1829744, 640.0: 0.175, 641.0: 0.1672235, 642.0: 0.1596464, 643.0: 0.1522776, 644.0: 0.1451259, 645.0: 0.1382, 646.0: 0.1315003, 647.0: 0.1250248, 648.0: 0.1187792, 649.0: 0.1127691, 650.0: 0.107, 651.0: 0.1014762, 652.0: 0.09618864, 653.0: 0.09112296, 654.0: 0.08626485, 655.0: 0.0816, 656.0: 0.07712064, 657.0: 0.07282552, 658.0: 0.06871008, 659.0: 0.06476976, 660.0: 0.061, 661.0: 0.05739621, 662.0: 0.05395504, 663.0: 0.05067376, 664.0: 0.04754965, 665.0: 0.04458, 666.0: 0.04175872, 667.0: 0.03908496, 668.0: 0.03656384, 669.0: 0.03420048, 670.0: 0.032, 671.0: 0.02996261, 672.0: 0.02807664, 673.0: 0.02632936, 674.0: 0.02470805, 675.0: 0.0232, 676.0: 0.02180077, 677.0: 0.02050112, 678.0: 0.01928108, 679.0: 0.01812069, 680.0: 0.017, 681.0: 0.01590379, 682.0: 0.01483718, 683.0: 0.01381068, 684.0: 0.01283478, 685.0: 0.01192, 686.0: 0.01106831, 687.0: 0.01027339, 688.0: 0.009533311, 689.0: 0.008846157, 690.0: 0.00821, 691.0: 0.007623781, 692.0: 0.007085424, 693.0: 0.006591476, 694.0: 0.006138485, 695.0: 0.005723, 696.0: 0.005343059, 697.0: 0.004995796, 698.0: 0.004676404, 699.0: 0.004380075, 700.0: 0.004102, 701.0: 0.003838453, 702.0: 0.003589099, 703.0: 0.003354219, 704.0: 0.003134093, 705.0: 0.002929, 706.0: 0.002738139, 707.0: 0.002559876, 708.0: 0.002393244, 709.0: 0.002237275, 710.0: 0.002091, 711.0: 0.001953587, 712.0: 0.00182458, 713.0: 0.00170358, 714.0: 0.001590187, 715.0: 0.001484, 716.0: 0.001384496, 717.0: 0.001291268, 718.0: 0.001204092, 719.0: 0.001122744, 720.0: 0.001047, 721.0: 0.0009765896, 722.0: 0.0009111088, 723.0: 0.0008501332, 724.0: 0.0007932384, 725.0: 0.00074, 726.0: 0.0006900827, 727.0: 0.00064331, 728.0: 0.000599496, 729.0: 0.0005584547, 730.0: 0.00052, 731.0: 0.0004839136, 732.0: 0.0004500528, 733.0: 0.0004183452, 734.0: 0.0003887184, 735.0: 0.0003611, 736.0: 0.0003353835, 737.0: 0.0003114404, 738.0: 0.0002891656, 739.0: 0.0002684539, 740.0: 0.0002492, 741.0: 0.0002313019, 742.0: 0.0002146856, 743.0: 0.0001992884, 744.0: 0.0001850475, 745.0: 0.0001719, 746.0: 0.0001597781, 747.0: 0.0001486044, 748.0: 0.0001383016, 749.0: 0.0001287925, 750.0: 0.00012, 751.0: 0.0001118595, 752.0: 0.0001043224, 753.0: 9.73356e-05, 754.0: 9.084587e-05, 755.0: 8.48e-05, 756.0: 7.914667e-05, 757.0: 7.3858e-05, 758.0: 6.8916e-05, 759.0: 6.430267e-05, 760.0: 6e-05, 761.0: 5.598187e-05, 762.0: 5.22256e-05, 763.0: 4.87184e-05, 764.0: 4.544747e-05, 765.0: 4.24e-05, 766.0: 3.956104e-05, 767.0: 3.691512e-05, 768.0: 3.444868e-05, 769.0: 3.214816e-05, 770.0: 3e-05, 771.0: 2.799125e-05, 772.0: 2.611356e-05, 773.0: 2.436024e-05, 774.0: 2.272461e-05, 775.0: 2.12e-05, 776.0: 1.977855e-05, 777.0: 1.845285e-05, 778.0: 1.721687e-05, 779.0: 1.606459e-05, 780.0: 1.499e-05, 781.0: 1.398728e-05, 782.0: 1.305155e-05, 783.0: 1.217818e-05, 784.0: 1.136254e-05, 785.0: 1.06e-05, 786.0: 9.885877e-06, 787.0: 9.217304e-06, 788.0: 8.592362e-06, 789.0: 8.009133e-06, 790.0: 7.4657e-06, 791.0: 6.959567e-06, 792.0: 6.487995e-06, 793.0: 6.048699e-06, 794.0: 5.639396e-06, 795.0: 5.2578e-06, 796.0: 4.901771e-06, 797.0: 4.56972e-06, 798.0: 4.260194e-06, 799.0: 3.971739e-06, 800.0: 3.7029e-06, 801.0: 3.452163e-06, 802.0: 3.218302e-06, 803.0: 3.0003e-06, 804.0: 2.797139e-06, 805.0: 2.6078e-06, 806.0: 2.43122e-06, 807.0: 2.266531e-06, 808.0: 2.113013e-06, 809.0: 1.969943e-06, 810.0: 1.8366e-06, 811.0: 1.71223e-06, 812.0: 1.596228e-06, 813.0: 1.48809e-06, 814.0: 1.387314e-06, 815.0: 1.2934e-06, 816.0: 1.20582e-06, 817.0: 1.124143e-06, 818.0: 1.048009e-06, 819.0: 9.770578e-07, 820.0: 9.1093e-07, 821.0: 8.492513e-07, 822.0: 7.917212e-07, 823.0: 7.380904e-07, 824.0: 6.881098e-07, 825.0: 6.4153e-07, 826.0: 5.980895e-07, 827.0: 5.575746e-07, 828.0: 5.19808e-07, 829.0: 4.846123e-07, 830.0: 4.5181e-07}))[source]¶

Returns the luminous efficiency of given spectral power distribution using given luminous efficiency function.

Parameters:	spd (SpectralPowerDistribution) – test spectral power distribution lef (SpectralPowerDistribution, optional) – $V(\lambda)$ luminous efficiency function.
Returns:	Luminous efficiency.
Return type:	numeric

Examples

>>> from colour import LIGHT_SOURCES_RELATIVE_SPDS
>>> spd = LIGHT_SOURCES_RELATIVE_SPDS['Neodimium Incandescent']
>>> luminous_efficiency(spd)  
0.1994393...

colour.colorimetry.luminous_efficacy(spd, lef=SpectralPowerDistribution( 'CIE 1924 Photopic Standard Observer', {360.0: 3.917e-06, 361.0: 4.393581e-06, 362.0: 4.929604e-06, 363.0: 5.532136e-06, 364.0: 6.208245e-06, 365.0: 6.965e-06, 366.0: 7.813219e-06, 367.0: 8.767336e-06, 368.0: 9.839844e-06, 369.0: 1.104323e-05, 370.0: 1.239e-05, 371.0: 1.388641e-05, 372.0: 1.555728e-05, 373.0: 1.744296e-05, 374.0: 1.958375e-05, 375.0: 2.202e-05, 376.0: 2.483965e-05, 377.0: 2.804126e-05, 378.0: 3.153104e-05, 379.0: 3.521521e-05, 380.0: 3.9e-05, 381.0: 4.28264e-05, 382.0: 4.69146e-05, 383.0: 5.15896e-05, 384.0: 5.71764e-05, 385.0: 6.4e-05, 386.0: 7.234421e-05, 387.0: 8.221224e-05, 388.0: 9.350816e-05, 389.0: 0.0001061361, 390.0: 0.00012, 391.0: 0.000134984, 392.0: 0.000151492, 393.0: 0.000170208, 394.0: 0.000191816, 395.0: 0.000217, 396.0: 0.0002469067, 397.0: 0.00028124, 398.0: 0.00031852, 399.0: 0.0003572667, 400.0: 0.000396, 401.0: 0.0004337147, 402.0: 0.000473024, 403.0: 0.000517876, 404.0: 0.0005722187, 405.0: 0.00064, 406.0: 0.00072456, 407.0: 0.0008255, 408.0: 0.00094116, 409.0: 0.00106988, 410.0: 0.00121, 411.0: 0.001362091, 412.0: 0.001530752, 413.0: 0.001720368, 414.0: 0.001935323, 415.0: 0.00218, 416.0: 0.0024548, 417.0: 0.002764, 418.0: 0.0031178, 419.0: 0.0035264, 420.0: 0.004, 421.0: 0.00454624, 422.0: 0.00515932, 423.0: 0.00582928, 424.0: 0.00654616, 425.0: 0.0073, 426.0: 0.008086507, 427.0: 0.00890872, 428.0: 0.00976768, 429.0: 0.01066443, 430.0: 0.0116, 431.0: 0.01257317, 432.0: 0.01358272, 433.0: 0.01462968, 434.0: 0.01571509, 435.0: 0.01684, 436.0: 0.01800736, 437.0: 0.01921448, 438.0: 0.02045392, 439.0: 0.02171824, 440.0: 0.023, 441.0: 0.02429461, 442.0: 0.02561024, 443.0: 0.02695857, 444.0: 0.02835125, 445.0: 0.0298, 446.0: 0.03131083, 447.0: 0.03288368, 448.0: 0.03452112, 449.0: 0.03622571, 450.0: 0.038, 451.0: 0.03984667, 452.0: 0.041768, 453.0: 0.043766, 454.0: 0.04584267, 455.0: 0.048, 456.0: 0.05024368, 457.0: 0.05257304, 458.0: 0.05498056, 459.0: 0.05745872, 460.0: 0.06, 461.0: 0.06260197, 462.0: 0.06527752, 463.0: 0.06804208, 464.0: 0.07091109, 465.0: 0.0739, 466.0: 0.077016, 467.0: 0.0802664, 468.0: 0.0836668, 469.0: 0.0872328, 470.0: 0.09098, 471.0: 0.09491755, 472.0: 0.09904584, 473.0: 0.1033674, 474.0: 0.1078846, 475.0: 0.1126, 476.0: 0.117532, 477.0: 0.1226744, 478.0: 0.1279928, 479.0: 0.1334528, 480.0: 0.13902, 481.0: 0.1446764, 482.0: 0.1504693, 483.0: 0.1564619, 484.0: 0.1627177, 485.0: 0.1693, 486.0: 0.1762431, 487.0: 0.1835581, 488.0: 0.1912735, 489.0: 0.199418, 490.0: 0.20802, 491.0: 0.2171199, 492.0: 0.2267345, 493.0: 0.2368571, 494.0: 0.2474812, 495.0: 0.2586, 496.0: 0.2701849, 497.0: 0.2822939, 498.0: 0.2950505, 499.0: 0.308578, 500.0: 0.323, 501.0: 0.3384021, 502.0: 0.3546858, 503.0: 0.3716986, 504.0: 0.3892875, 505.0: 0.4073, 506.0: 0.4256299, 507.0: 0.4443096, 508.0: 0.4633944, 509.0: 0.4829395, 510.0: 0.503, 511.0: 0.5235693, 512.0: 0.544512, 513.0: 0.56569, 514.0: 0.5869653, 515.0: 0.6082, 516.0: 0.6293456, 517.0: 0.6503068, 518.0: 0.6708752, 519.0: 0.6908424, 520.0: 0.71, 521.0: 0.7281852, 522.0: 0.7454636, 523.0: 0.7619694, 524.0: 0.7778368, 525.0: 0.7932, 526.0: 0.8081104, 527.0: 0.8224962, 528.0: 0.8363068, 529.0: 0.8494916, 530.0: 0.862, 531.0: 0.8738108, 532.0: 0.8849624, 533.0: 0.8954936, 534.0: 0.9054432, 535.0: 0.9148501, 536.0: 0.9237348, 537.0: 0.9320924, 538.0: 0.9399226, 539.0: 0.9472252, 540.0: 0.954, 541.0: 0.9602561, 542.0: 0.9660074, 543.0: 0.9712606, 544.0: 0.9760225, 545.0: 0.9803, 546.0: 0.9840924, 547.0: 0.9874182, 548.0: 0.9903128, 549.0: 0.9928116, 550.0: 0.9949501, 551.0: 0.9967108, 552.0: 0.9980983, 553.0: 0.999112, 554.0: 0.9997482, 555.0: 1.0, 556.0: 0.9998567, 557.0: 0.9993046, 558.0: 0.9983255, 559.0: 0.9968987, 560.0: 0.995, 561.0: 0.9926005, 562.0: 0.9897426, 563.0: 0.9864444, 564.0: 0.9827241, 565.0: 0.9786, 566.0: 0.9740837, 567.0: 0.9691712, 568.0: 0.9638568, 569.0: 0.9581349, 570.0: 0.952, 571.0: 0.9454504, 572.0: 0.9384992, 573.0: 0.9311628, 574.0: 0.9234576, 575.0: 0.9154, 576.0: 0.9070064, 577.0: 0.8982772, 578.0: 0.8892048, 579.0: 0.8797816, 580.0: 0.87, 581.0: 0.8598613, 582.0: 0.849392, 583.0: 0.838622, 584.0: 0.8275813, 585.0: 0.8163, 586.0: 0.8047947, 587.0: 0.793082, 588.0: 0.781192, 589.0: 0.7691547, 590.0: 0.757, 591.0: 0.7447541, 592.0: 0.7324224, 593.0: 0.7200036, 594.0: 0.7074965, 595.0: 0.6949, 596.0: 0.6822192, 597.0: 0.6694716, 598.0: 0.6566744, 599.0: 0.6438448, 600.0: 0.631, 601.0: 0.6181555, 602.0: 0.6053144, 603.0: 0.5924756, 604.0: 0.5796379, 605.0: 0.5668, 606.0: 0.5539611, 607.0: 0.5411372, 608.0: 0.5283528, 609.0: 0.5156323, 610.0: 0.503, 611.0: 0.4904688, 612.0: 0.4780304, 613.0: 0.4656776, 614.0: 0.4534032, 615.0: 0.4412, 616.0: 0.42908, 617.0: 0.417036, 618.0: 0.405032, 619.0: 0.393032, 620.0: 0.381, 621.0: 0.3689184, 622.0: 0.3568272, 623.0: 0.3447768, 624.0: 0.3328176, 625.0: 0.321, 626.0: 0.3093381, 627.0: 0.2978504, 628.0: 0.2865936, 629.0: 0.2756245, 630.0: 0.265, 631.0: 0.2547632, 632.0: 0.2448896, 633.0: 0.2353344, 634.0: 0.2260528, 635.0: 0.217, 636.0: 0.2081616, 637.0: 0.1995488, 638.0: 0.1911552, 639.0: 0.1829744, 640.0: 0.175, 641.0: 0.1672235, 642.0: 0.1596464, 643.0: 0.1522776, 644.0: 0.1451259, 645.0: 0.1382, 646.0: 0.1315003, 647.0: 0.1250248, 648.0: 0.1187792, 649.0: 0.1127691, 650.0: 0.107, 651.0: 0.1014762, 652.0: 0.09618864, 653.0: 0.09112296, 654.0: 0.08626485, 655.0: 0.0816, 656.0: 0.07712064, 657.0: 0.07282552, 658.0: 0.06871008, 659.0: 0.06476976, 660.0: 0.061, 661.0: 0.05739621, 662.0: 0.05395504, 663.0: 0.05067376, 664.0: 0.04754965, 665.0: 0.04458, 666.0: 0.04175872, 667.0: 0.03908496, 668.0: 0.03656384, 669.0: 0.03420048, 670.0: 0.032, 671.0: 0.02996261, 672.0: 0.02807664, 673.0: 0.02632936, 674.0: 0.02470805, 675.0: 0.0232, 676.0: 0.02180077, 677.0: 0.02050112, 678.0: 0.01928108, 679.0: 0.01812069, 680.0: 0.017, 681.0: 0.01590379, 682.0: 0.01483718, 683.0: 0.01381068, 684.0: 0.01283478, 685.0: 0.01192, 686.0: 0.01106831, 687.0: 0.01027339, 688.0: 0.009533311, 689.0: 0.008846157, 690.0: 0.00821, 691.0: 0.007623781, 692.0: 0.007085424, 693.0: 0.006591476, 694.0: 0.006138485, 695.0: 0.005723, 696.0: 0.005343059, 697.0: 0.004995796, 698.0: 0.004676404, 699.0: 0.004380075, 700.0: 0.004102, 701.0: 0.003838453, 702.0: 0.003589099, 703.0: 0.003354219, 704.0: 0.003134093, 705.0: 0.002929, 706.0: 0.002738139, 707.0: 0.002559876, 708.0: 0.002393244, 709.0: 0.002237275, 710.0: 0.002091, 711.0: 0.001953587, 712.0: 0.00182458, 713.0: 0.00170358, 714.0: 0.001590187, 715.0: 0.001484, 716.0: 0.001384496, 717.0: 0.001291268, 718.0: 0.001204092, 719.0: 0.001122744, 720.0: 0.001047, 721.0: 0.0009765896, 722.0: 0.0009111088, 723.0: 0.0008501332, 724.0: 0.0007932384, 725.0: 0.00074, 726.0: 0.0006900827, 727.0: 0.00064331, 728.0: 0.000599496, 729.0: 0.0005584547, 730.0: 0.00052, 731.0: 0.0004839136, 732.0: 0.0004500528, 733.0: 0.0004183452, 734.0: 0.0003887184, 735.0: 0.0003611, 736.0: 0.0003353835, 737.0: 0.0003114404, 738.0: 0.0002891656, 739.0: 0.0002684539, 740.0: 0.0002492, 741.0: 0.0002313019, 742.0: 0.0002146856, 743.0: 0.0001992884, 744.0: 0.0001850475, 745.0: 0.0001719, 746.0: 0.0001597781, 747.0: 0.0001486044, 748.0: 0.0001383016, 749.0: 0.0001287925, 750.0: 0.00012, 751.0: 0.0001118595, 752.0: 0.0001043224, 753.0: 9.73356e-05, 754.0: 9.084587e-05, 755.0: 8.48e-05, 756.0: 7.914667e-05, 757.0: 7.3858e-05, 758.0: 6.8916e-05, 759.0: 6.430267e-05, 760.0: 6e-05, 761.0: 5.598187e-05, 762.0: 5.22256e-05, 763.0: 4.87184e-05, 764.0: 4.544747e-05, 765.0: 4.24e-05, 766.0: 3.956104e-05, 767.0: 3.691512e-05, 768.0: 3.444868e-05, 769.0: 3.214816e-05, 770.0: 3e-05, 771.0: 2.799125e-05, 772.0: 2.611356e-05, 773.0: 2.436024e-05, 774.0: 2.272461e-05, 775.0: 2.12e-05, 776.0: 1.977855e-05, 777.0: 1.845285e-05, 778.0: 1.721687e-05, 779.0: 1.606459e-05, 780.0: 1.499e-05, 781.0: 1.398728e-05, 782.0: 1.305155e-05, 783.0: 1.217818e-05, 784.0: 1.136254e-05, 785.0: 1.06e-05, 786.0: 9.885877e-06, 787.0: 9.217304e-06, 788.0: 8.592362e-06, 789.0: 8.009133e-06, 790.0: 7.4657e-06, 791.0: 6.959567e-06, 792.0: 6.487995e-06, 793.0: 6.048699e-06, 794.0: 5.639396e-06, 795.0: 5.2578e-06, 796.0: 4.901771e-06, 797.0: 4.56972e-06, 798.0: 4.260194e-06, 799.0: 3.971739e-06, 800.0: 3.7029e-06, 801.0: 3.452163e-06, 802.0: 3.218302e-06, 803.0: 3.0003e-06, 804.0: 2.797139e-06, 805.0: 2.6078e-06, 806.0: 2.43122e-06, 807.0: 2.266531e-06, 808.0: 2.113013e-06, 809.0: 1.969943e-06, 810.0: 1.8366e-06, 811.0: 1.71223e-06, 812.0: 1.596228e-06, 813.0: 1.48809e-06, 814.0: 1.387314e-06, 815.0: 1.2934e-06, 816.0: 1.20582e-06, 817.0: 1.124143e-06, 818.0: 1.048009e-06, 819.0: 9.770578e-07, 820.0: 9.1093e-07, 821.0: 8.492513e-07, 822.0: 7.917212e-07, 823.0: 7.380904e-07, 824.0: 6.881098e-07, 825.0: 6.4153e-07, 826.0: 5.980895e-07, 827.0: 5.575746e-07, 828.0: 5.19808e-07, 829.0: 4.846123e-07, 830.0: 4.5181e-07}))[source]¶

Returns the luminous efficacy in $lm\cdot W^{-1}$ of given spectral power distribution using given luminous efficiency function.

Parameters:	spd (SpectralPowerDistribution) – test spectral power distribution lef (SpectralPowerDistribution, optional) – $V(\lambda)$ luminous efficiency function.
Returns:	Luminous efficacy in $lm\cdot W^{-1}$.
Return type:	numeric

Examples

>>> from colour import LIGHT_SOURCES_RELATIVE_SPDS
>>> spd = LIGHT_SOURCES_RELATIVE_SPDS['Neodimium Incandescent']
>>> luminous_efficacy(spd)  
136.2170803...

colour.colorimetry.RGB_10_degree_cmfs_to_LMS_10_degree_cmfs(wavelength)[source]¶

Converts Stiles & Burch 1959 10 Degree RGB CMFs colour matching functions into the Stockman & Sharpe 10 Degree Cone Fundamentals spectral sensitivity functions.

Parameters:	wavelength (numeric or array_like) – Wavelength $\lambda$ in nm.
Returns:	Stockman & Sharpe 10 Degree Cone Fundamentals spectral tristimulus values.
Return type:	ndarray

Notes

Data for the Stockman & Sharpe 10 Degree Cone Fundamentals already exists, this definition is intended for educational purpose.

References

[3]	CIE TC 1-36. (2006). CIE 170-1:2006 Fundamental Chromaticity Diagram with Physiological Axes - Part 1 (pp. 1–56). ISBN:978-3-901-90646-6

Examples

>>> RGB_10_degree_cmfs_to_LMS_10_degree_cmfs(700)  
array([ 0.0052860...,  0.0003252...,  0.        ])

colour.colorimetry.RGB_2_degree_cmfs_to_XYZ_2_degree_cmfs(wavelength)[source]¶

Converts Wright & Guild 1931 2 Degree RGB CMFs colour matching functions into the CIE 1931 2 Degree Standard Observer colour matching functions.

Parameters:	wavelength (numeric or array_like) – Wavelength $\lambda$ in nm.
Returns:	CIE 1931 2 Degree Standard Observer spectral tristimulus values.
Return type:	ndarray

Notes

Data for the CIE 1931 2 Degree Standard Observer already exists, this definition is intended for educational purpose.

References

[1]	Wyszecki, G., & Stiles, W. S. (2000). Table 1(3.3.3). In Color Science: Concepts and Methods, Quantitative Data and Formulae (pp. 138–139). Wiley. ISBN:978-0471399186

Examples

>>> RGB_2_degree_cmfs_to_XYZ_2_degree_cmfs(700)  
array([ 0.0113577...,  0.004102  ,  0.        ])

colour.colorimetry.RGB_10_degree_cmfs_to_XYZ_10_degree_cmfs(wavelength)[source]¶

Converts Stiles & Burch 1959 10 Degree RGB CMFs colour matching functions into the CIE 1964 10 Degree Standard Observer colour matching functions.

Parameters:	wavelength (numeric or array_like) – Wavelength $\lambda$ in nm.
Returns:	CIE 1964 10 Degree Standard Observer spectral tristimulus values.
Return type:	ndarray

Notes

Data for the CIE 1964 10 Degree Standard Observer already exists, this definition is intended for educational purpose.

References

[2]	Wyszecki, G., & Stiles, W. S. (2000). The CIE 1964 Standard Observer. In Color Science: Concepts and Methods, Quantitative Data and Formulae (p. 141). Wiley. ISBN:978-0471399186

Examples

>>> RGB_10_degree_cmfs_to_XYZ_10_degree_cmfs(700)  
array([  9.6432150...e-03,   3.7526317...e-03,  -4.1078830...e-06])

colour.colorimetry.LMS_2_degree_cmfs_to_XYZ_2_degree_cmfs(wavelength)[source]¶

Converts Stockman & Sharpe 2 Degree Cone Fundamentals colour matching functions into the CIE 2012 2 Degree Standard Observer colour matching functions.

Parameters:	wavelength (numeric or array_like) – Wavelength $\lambda$ in nm.
Returns:	CIE 2012 2 Degree Standard Observer spectral tristimulus values.
Return type:	ndarray

Notes

Data for the CIE 2012 2 Degree Standard Observer already exists, this definition is intended for educational purpose.

References

[4]	CVRL. (n.d.). CIE (2012) 2-deg XYZ “physiologically-relevant” colour matching functions. Retrieved June 25, 2014, from http://www.cvrl.org/database/text/cienewxyz/cie2012xyz2.htm

Examples

>>> LMS_2_degree_cmfs_to_XYZ_2_degree_cmfs(700)  
array([ 0.0109677...,  0.0041959...,  0.        ])

colour.colorimetry.LMS_10_degree_cmfs_to_XYZ_10_degree_cmfs(wavelength)[source]¶

Converts Stockman & Sharpe 10 Degree Cone Fundamentals colour matching functions into the CIE 2012 10 Degree Standard Observer colour matching functions.

Parameters:	wavelength (numeric or array_like) – Wavelength $\lambda$ in nm.
Returns:	CIE 2012 10 Degree Standard Observer spectral tristimulus values.
Return type:	ndarray

Notes

Data for the CIE 2012 10 Degree Standard Observer already exists, this definition is intended for educational purpose.

References

[5]	CVRL. (n.d.). CIE (2012) 10-deg XYZ “physiologically-relevant” colour matching functions. Retrieved June 25, 2014, from http://www.cvrl.org/database/text/cienewxyz/cie2012xyz10.htm

Examples

>>> LMS_10_degree_cmfs_to_XYZ_10_degree_cmfs(700)  
array([ 0.0098162...,  0.0037761...,  0.        ])

colour.colorimetry.spectral_to_XYZ(spd, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 403.0: 0.01878122, 404.0: 0.02074801, 405.0: 0.02319, 406.0: 0.02620736, 407.0: 0.02978248, 408.0: 0.03388092, 409.0: 0.03846824, 410.0: 0.04351, 411.0: 0.0489956, 412.0: 0.0550226, 413.0: 0.0617188, 414.0: 0.069212, 415.0: 0.07763, 416.0: 0.08695811, 417.0: 0.09717672, 418.0: 0.1084063, 419.0: 0.1207672, 420.0: 0.13438, 421.0: 0.1493582, 422.0: 0.1653957, 423.0: 0.1819831, 424.0: 0.198611, 425.0: 0.21477, 426.0: 0.2301868, 427.0: 0.2448797, 428.0: 0.2587773, 429.0: 0.2718079, 430.0: 0.2839, 431.0: 0.2949438, 432.0: 0.3048965, 433.0: 0.3137873, 434.0: 0.3216454, 435.0: 0.3285, 436.0: 0.3343513, 437.0: 0.3392101, 438.0: 0.3431213, 439.0: 0.3461296, 440.0: 0.34828, 441.0: 0.3495999, 442.0: 0.3501474, 443.0: 0.350013, 444.0: 0.349287, 445.0: 0.34806, 446.0: 0.3463733, 447.0: 0.3442624, 448.0: 0.3418088, 449.0: 0.3390941, 450.0: 0.3362, 451.0: 0.3331977, 452.0: 0.3300411, 453.0: 0.3266357, 454.0: 0.3228868, 455.0: 0.3187, 456.0: 0.3140251, 457.0: 0.308884, 458.0: 0.3032904, 459.0: 0.2972579, 460.0: 0.2908, 461.0: 0.2839701, 462.0: 0.2767214, 463.0: 0.2689178, 464.0: 0.2604227, 465.0: 0.2511, 466.0: 0.2408475, 467.0: 0.2298512, 468.0: 0.2184072, 469.0: 0.2068115, 470.0: 0.19536, 471.0: 0.1842136, 472.0: 0.1733273, 473.0: 0.1626881, 474.0: 0.1522833, 475.0: 0.1421, 476.0: 0.1321786, 477.0: 0.1225696, 478.0: 0.1132752, 479.0: 0.1042979, 480.0: 0.09564, 481.0: 0.08729955, 482.0: 0.07930804, 483.0: 0.07171776, 484.0: 0.06458099, 485.0: 0.05795001, 486.0: 0.05186211, 487.0: 0.04628152, 488.0: 0.04115088, 489.0: 0.03641283, 490.0: 0.03201, 491.0: 0.0279172, 492.0: 0.0241444, 493.0: 0.020687, 494.0: 0.0175404, 495.0: 0.0147, 496.0: 0.01216179, 497.0: 0.00991996, 498.0: 0.00796724, 499.0: 0.006296346, 500.0: 0.0049, 501.0: 0.003777173, 502.0: 0.00294532, 503.0: 0.00242488, 504.0: 0.002236293, 505.0: 0.0024, 506.0: 0.00292552, 507.0: 0.00383656, 508.0: 0.00517484, 509.0: 0.00698208, 510.0: 0.0093, 511.0: 0.01214949, 512.0: 0.01553588, 513.0: 0.01947752, 514.0: 0.02399277, 515.0: 0.0291, 516.0: 0.03481485, 517.0: 0.04112016, 518.0: 0.04798504, 519.0: 0.05537861, 520.0: 0.06327, 521.0: 0.07163501, 522.0: 0.08046224, 523.0: 0.08973996, 524.0: 0.09945645, 525.0: 0.1096, 526.0: 0.1201674, 527.0: 0.1311145, 528.0: 0.1423679, 529.0: 0.1538542, 530.0: 0.1655, 531.0: 0.1772571, 532.0: 0.18914, 533.0: 0.2011694, 534.0: 0.2133658, 535.0: 0.2257499, 536.0: 0.2383209, 537.0: 0.2510668, 538.0: 0.2639922, 539.0: 0.2771017, 540.0: 0.2904, 541.0: 0.3038912, 542.0: 0.3175726, 543.0: 0.3314384, 544.0: 0.3454828, 545.0: 0.3597, 546.0: 0.3740839, 547.0: 0.3886396, 548.0: 0.4033784, 549.0: 0.4183115, 550.0: 0.4334499, 551.0: 0.4487953, 552.0: 0.464336, 553.0: 0.480064, 554.0: 0.4959713, 555.0: 0.5120501, 556.0: 0.5282959, 557.0: 0.5446916, 558.0: 0.5612094, 559.0: 0.5778215, 560.0: 0.5945, 561.0: 0.6112209, 562.0: 0.6279758, 563.0: 0.6447602, 564.0: 0.6615697, 565.0: 0.6784, 566.0: 0.6952392, 567.0: 0.7120586, 568.0: 0.7288284, 569.0: 0.7455188, 570.0: 0.7621, 571.0: 0.7785432, 572.0: 0.7948256, 573.0: 0.8109264, 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590.0: 1.0, 591.0: 1.0, 592.0: 1.0, 593.0: 1.0, 594.0: 1.0, 595.0: 1.0, 596.0: 1.0, 597.0: 1.0, 598.0: 1.0, 599.0: 1.0, 600.0: 1.0, 601.0: 1.0, 602.0: 1.0, 603.0: 1.0, 604.0: 1.0, 605.0: 1.0, 606.0: 1.0, 607.0: 1.0, 608.0: 1.0, 609.0: 1.0, 610.0: 1.0, 611.0: 1.0, 612.0: 1.0, 613.0: 1.0, 614.0: 1.0, 615.0: 1.0, 616.0: 1.0, 617.0: 1.0, 618.0: 1.0, 619.0: 1.0, 620.0: 1.0, 621.0: 1.0, 622.0: 1.0, 623.0: 1.0, 624.0: 1.0, 625.0: 1.0, 626.0: 1.0, 627.0: 1.0, 628.0: 1.0, 629.0: 1.0, 630.0: 1.0, 631.0: 1.0, 632.0: 1.0, 633.0: 1.0, 634.0: 1.0, 635.0: 1.0, 636.0: 1.0, 637.0: 1.0, 638.0: 1.0, 639.0: 1.0, 640.0: 1.0, 641.0: 1.0, 642.0: 1.0, 643.0: 1.0, 644.0: 1.0, 645.0: 1.0, 646.0: 1.0, 647.0: 1.0, 648.0: 1.0, 649.0: 1.0, 650.0: 1.0, 651.0: 1.0, 652.0: 1.0, 653.0: 1.0, 654.0: 1.0, 655.0: 1.0, 656.0: 1.0, 657.0: 1.0, 658.0: 1.0, 659.0: 1.0, 660.0: 1.0, 661.0: 1.0, 662.0: 1.0, 663.0: 1.0, 664.0: 1.0, 665.0: 1.0, 666.0: 1.0, 667.0: 1.0, 668.0: 1.0, 669.0: 1.0, 670.0: 1.0, 671.0: 1.0, 672.0: 1.0, 673.0: 1.0, 674.0: 1.0, 675.0: 1.0, 676.0: 1.0, 677.0: 1.0, 678.0: 1.0, 679.0: 1.0, 680.0: 1.0, 681.0: 1.0, 682.0: 1.0, 683.0: 1.0, 684.0: 1.0, 685.0: 1.0, 686.0: 1.0, 687.0: 1.0, 688.0: 1.0, 689.0: 1.0, 690.0: 1.0, 691.0: 1.0, 692.0: 1.0, 693.0: 1.0, 694.0: 1.0, 695.0: 1.0, 696.0: 1.0, 697.0: 1.0, 698.0: 1.0, 699.0: 1.0, 700.0: 1.0, 701.0: 1.0, 702.0: 1.0, 703.0: 1.0, 704.0: 1.0, 705.0: 1.0, 706.0: 1.0, 707.0: 1.0, 708.0: 1.0, 709.0: 1.0, 710.0: 1.0, 711.0: 1.0, 712.0: 1.0, 713.0: 1.0, 714.0: 1.0, 715.0: 1.0, 716.0: 1.0, 717.0: 1.0, 718.0: 1.0, 719.0: 1.0, 720.0: 1.0, 721.0: 1.0, 722.0: 1.0, 723.0: 1.0, 724.0: 1.0, 725.0: 1.0, 726.0: 1.0, 727.0: 1.0, 728.0: 1.0, 729.0: 1.0, 730.0: 1.0, 731.0: 1.0, 732.0: 1.0, 733.0: 1.0, 734.0: 1.0, 735.0: 1.0, 736.0: 1.0, 737.0: 1.0, 738.0: 1.0, 739.0: 1.0, 740.0: 1.0, 741.0: 1.0, 742.0: 1.0, 743.0: 1.0, 744.0: 1.0, 745.0: 1.0, 746.0: 1.0, 747.0: 1.0, 748.0: 1.0, 749.0: 1.0, 750.0: 1.0, 751.0: 1.0, 752.0: 1.0, 753.0: 1.0, 754.0: 1.0, 755.0: 1.0, 756.0: 1.0, 757.0: 1.0, 758.0: 1.0, 759.0: 1.0, 760.0: 1.0, 761.0: 1.0, 762.0: 1.0, 763.0: 1.0, 764.0: 1.0, 765.0: 1.0, 766.0: 1.0, 767.0: 1.0, 768.0: 1.0, 769.0: 1.0, 770.0: 1.0, 771.0: 1.0, 772.0: 1.0, 773.0: 1.0, 774.0: 1.0, 775.0: 1.0, 776.0: 1.0, 777.0: 1.0, 778.0: 1.0, 779.0: 1.0, 780.0: 1.0}), method=u'ASTM E308-15', **kwargs)[source]¶

Converts given spectral power distribution to CIE XYZ tristimulus values using given colour matching functions, illuminant and method.

Other Parameters:
Parameters:	spd (SpectralPowerDistribution) – Spectral power distribution. cmfs (XYZ_ColourMatchingFunctions) – Standard observer colour matching functions. illuminant (SpectralPowerDistribution, optional) – Illuminant spectral power distribution. method (unicode, optional) – {‘ASTM E308-15’, ‘Integration’}, Computation method.
	use_practice_range (bool, optional) – {`spectral_to_XYZ_ASTME30815()`}, Practise ASTM E308-15 working wavelengths range is [360, 780], if True this argument will trim the colour matching functions appropriately. mi_5nm_omission_method (bool, optional) – {`spectral_to_XYZ_ASTME30815()`}, 5 nm measurement intervals spectral power distribution conversion to tristimulus values will use a 5 nm version of the colour matching functions instead of a table of tristimulus weighting factors. mi_20nm_interpolation_method (bool, optional) – {`spectral_to_XYZ_ASTME30815()`}, 20 nm measurement intervals spectral power distribution conversion to tristimulus values will use a dedicated interpolation method instead of a table of tristimulus weighting factors.
Returns:	CIE XYZ tristimulus values.
Return type:	ndarray, (3,)

Warning

The output range of that definition is non standard!

Notes

Output CIE XYZ tristimulus values are in range [0, 100].

Examples

>>> from colour import (
...     CMFS, ILLUMINANTS_RELATIVE_SPDS, SpectralPowerDistribution)
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> data = {
...     400: 0.0641,
...     420: 0.0645,
...     440: 0.0562,
...     460: 0.0537,
...     480: 0.0559,
...     500: 0.0651,
...     520: 0.0705,
...     540: 0.0772,
...     560: 0.0870,
...     580: 0.1128,
...     600: 0.1360,
...     620: 0.1511,
...     640: 0.1688,
...     660: 0.1996,
...     680: 0.2397,
...     700: 0.2852}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> illuminant = ILLUMINANTS_RELATIVE_SPDS['D50']
>>> spectral_to_XYZ(  
...     spd, cmfs, illuminant)
array([ 11.5290265...,   9.9502091...,   4.7098882...])
>>> spectral_to_XYZ(  
...     spd, cmfs, illuminant, use_practice_range=False)
array([ 11.5291275...,   9.9502369...,   4.7098811...])
>>> spectral_to_XYZ(  
...     spd, cmfs, illuminant, method='Integration')
array([ 11.5296285...,   9.9499467...,   4.7066079...])

colour.colorimetry.lagrange_coefficients_ASTME202211(interval=10, interval_type=u'inner')[source]¶

Computes the Lagrange Coefficients for given interval size using practise ASTM E2022-11 method [1]_.

Parameters:	interval (int) – Interval size in nm. interval_type (unicode, optional) – {‘inner’, ‘boundary’}, If the interval is an inner interval Lagrange Coefficients are computed for degree 4. Degree 3 is used for a boundary interval.
Returns:	Lagrange Coefficients.
Return type:	ndarray

See also

colour.lagrange_coefficients()

Examples

>>> lagrange_coefficients_ASTME202211(  
...     10, 'inner')
array([[-0.028...,  0.940...,  0.104..., -0.016...],
       [-0.048...,  0.864...,  0.216..., -0.032...],
       [-0.059...,  0.773...,  0.331..., -0.045...],
       [-0.064...,  0.672...,  0.448..., -0.056...],
       [-0.062...,  0.562...,  0.562..., -0.062...],
       [-0.056...,  0.448...,  0.672..., -0.064...],
       [-0.045...,  0.331...,  0.773..., -0.059...],
       [-0.032...,  0.216...,  0.864..., -0.048...],
       [-0.016...,  0.104...,  0.940..., -0.028...]])
>>> lagrange_coefficients_ASTME202211(  
...     10, 'boundary')
array([[ 0.85...,  0.19..., -0.04...],
       [ 0.72...,  0.36..., -0.08...],
       [ 0.59...,  0.51..., -0.10...],
       [ 0.48...,  0.64..., -0.12...],
       [ 0.37...,  0.75..., -0.12...],
       [ 0.28...,  0.84..., -0.12...],
       [ 0.19...,  0.91..., -0.10...],
       [ 0.12...,  0.96..., -0.08...],
       [ 0.05...,  0.99..., -0.04...]])

colour.colorimetry.tristimulus_weighting_factors_ASTME202211(cmfs, illuminant, shape)[source]¶

Returns a table of tristimulus weighting factors for given colour matching functions and illuminant using practise ASTM E2022-11 method [1]_.

The computed table of tristimulus weighting factors should be used with spectral data that has been corrected for spectral bandpass dependence.

Parameters:	cmfs (XYZ_ColourMatchingFunctions) – Standard observer colour matching functions. illuminant (SpectralPowerDistribution) – Illuminant spectral power distribution. shape (SpectralShape) – Shape used to build the table, only the interval is needed.
Returns:	Tristimulus weighting factors table.
Return type:	ndarray
Raises:	`ValueError` – If the colour matching functions or illuminant intervals are not equal to 1 nm.

Warning

The tables of tristimulus weighting factors are cached in _TRISTIMULUS_WEIGHTING_FACTORS_CACHE attribute. Their identifier key is defined by the colour matching functions and illuminant names along the current shape such as: CIE 1964 10 Degree Standard Observer, A, (360.0, 830.0, 10.0) Considering the above, one should be mindful that using similar colour matching functions and illuminant names but with different spectral data will lead to unexpected behaviour.

Notes

Input colour matching functions and illuminant intervals are expected to be equal to 1 nm. If the illuminant data is not available at 1 nm interval, it needs to be interpolated using CIE recommendations: The method developed by Sprague (1880) should be used for interpolating functions having a uniformly spaced independent variable and a Cubic Spline method for non-uniformly spaced independent variable.

Examples

>>> from colour import (
...     CMFS,
...     CIE_standard_illuminant_A_function,
...     SpectralPowerDistribution,
...     SpectralShape)
>>> cmfs = CMFS['CIE 1964 10 Degree Standard Observer']
>>> wl = cmfs.shape.range()
>>> A = SpectralPowerDistribution(
...     'A (360, 830, 1)',
...     dict(zip(wl, CIE_standard_illuminant_A_function(wl))))
>>> tristimulus_weighting_factors_ASTME202211(  
...     cmfs, A, SpectralShape(360, 830, 20))
array([[ -2.9816934...e-04,  -3.1709762...e-05,  -1.3301218...e-03],
       [ -8.7154955...e-03,  -8.9154168...e-04,  -4.0743684...e-02],
       [  5.9967988...e-02,   5.0203497...e-03,   2.5650183...e-01],
       [  7.7342255...e-01,   7.7983983...e-02,   3.6965732...e+00],
       [  1.9000905...e+00,   3.0370051...e-01,   9.7554195...e+00],
       [  1.9707727...e+00,   8.5528092...e-01,   1.1486732...e+01],
       [  7.1836236...e-01,   2.1457000...e+00,   6.7845806...e+00],
       [  4.2666758...e-02,   4.8985328...e+00,   2.3208000...e+00],
       [  1.5223302...e+00,   9.6471138...e+00,   7.4306714...e-01],
       [  5.6770329...e+00,   1.4460970...e+01,   1.9581949...e-01],
       [  1.2445174...e+01,   1.7474254...e+01,   5.1826979...e-03],
       [  2.0553577...e+01,   1.7583821...e+01,  -2.6512696...e-03],
       [  2.5331538...e+01,   1.4895703...e+01,   0.0000000...e+00],
       [  2.1571157...e+01,   1.0079661...e+01,   0.0000000...e+00],
       [  1.2178581...e+01,   5.0680655...e+00,   0.0000000...e+00],
       [  4.6675746...e+00,   1.8303239...e+00,   0.0000000...e+00],
       [  1.3236117...e+00,   5.1296946...e-01,   0.0000000...e+00],
       [  3.1753258...e-01,   1.2300847...e-01,   0.0000000...e+00],
       [  7.4634128...e-02,   2.9024389...e-02,   0.0000000...e+00],
       [  1.8299016...e-02,   7.1606335...e-03,   0.0000000...e+00],
       [  4.7942065...e-03,   1.8888730...e-03,   0.0000000...e+00],
       [  1.3293045...e-03,   5.2774591...e-04,   0.0000000...e+00],
       [  4.2546928...e-04,   1.7041978...e-04,   0.0000000...e+00],
       [  9.6251115...e-05,   3.8955295...e-05,   0.0000000...e+00]])

colour.colorimetry.adjust_tristimulus_weighting_factors_ASTME30815(W, shape_r, shape_t)[source]¶

Adjusts given table of tristimulus weighting factors to account for a shorter wavelengths range of the test spectral shape compared to the reference spectral shape using practise ASTM E308-15 method [2]_: Weights at the wavelengths for which data are not available are added to the weights at the shortest and longest wavelength for which spectral data are available.

Parameters:	W (array_like) – Tristimulus weighting factors table. shape_r (SpectralShape) – Reference spectral shape. shape_t (SpectralShape) – Test spectral shape.
Returns:	Adjusted tristimulus weighting factors.
Return type:	ndarray

Examples

>>> from colour import (
...     CMFS,
...     CIE_standard_illuminant_A_function,
...     SpectralPowerDistribution,
...     SpectralShape)
>>> cmfs = CMFS['CIE 1964 10 Degree Standard Observer']
>>> wl = cmfs.shape.range()
>>> A = SpectralPowerDistribution(
...     'A (360, 830, 1)',
...     dict(zip(wl, CIE_standard_illuminant_A_function(wl))))
>>> W = tristimulus_weighting_factors_ASTME202211(
...     cmfs, A, SpectralShape(360, 830, 20))
>>> adjust_tristimulus_weighting_factors_ASTME30815(  
...     W, SpectralShape(360, 830, 20), SpectralShape(400, 700, 20))
array([[  5.0954324...e-02,   4.0970982...e-03,   2.1442802...e-01],
       [  7.7342255...e-01,   7.7983983...e-02,   3.6965732...e+00],
       [  1.9000905...e+00,   3.0370051...e-01,   9.7554195...e+00],
       [  1.9707727...e+00,   8.5528092...e-01,   1.1486732...e+01],
       [  7.1836236...e-01,   2.1457000...e+00,   6.7845806...e+00],
       [  4.2666758...e-02,   4.8985328...e+00,   2.3208000...e+00],
       [  1.5223302...e+00,   9.6471138...e+00,   7.4306714...e-01],
       [  5.6770329...e+00,   1.4460970...e+01,   1.9581949...e-01],
       [  1.2445174...e+01,   1.7474254...e+01,   5.1826979...e-03],
       [  2.0553577...e+01,   1.7583821...e+01,  -2.6512696...e-03],
       [  2.5331538...e+01,   1.4895703...e+01,   0.0000000...e+00],
       [  2.1571157...e+01,   1.0079661...e+01,   0.0000000...e+00],
       [  1.2178581...e+01,   5.0680655...e+00,   0.0000000...e+00],
       [  4.6675746...e+00,   1.8303239...e+00,   0.0000000...e+00],
       [  1.3236117...e+00,   5.1296946...e-01,   0.0000000...e+00],
       [  4.1711096...e-01,   1.6181949...e-01,   0.0000000...e+00]])

colour.colorimetry.spectral_to_XYZ_integration(spd, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 403.0: 0.01878122, 404.0: 0.02074801, 405.0: 0.02319, 406.0: 0.02620736, 407.0: 0.02978248, 408.0: 0.03388092, 409.0: 0.03846824, 410.0: 0.04351, 411.0: 0.0489956, 412.0: 0.0550226, 413.0: 0.0617188, 414.0: 0.069212, 415.0: 0.07763, 416.0: 0.08695811, 417.0: 0.09717672, 418.0: 0.1084063, 419.0: 0.1207672, 420.0: 0.13438, 421.0: 0.1493582, 422.0: 0.1653957, 423.0: 0.1819831, 424.0: 0.198611, 425.0: 0.21477, 426.0: 0.2301868, 427.0: 0.2448797, 428.0: 0.2587773, 429.0: 0.2718079, 430.0: 0.2839, 431.0: 0.2949438, 432.0: 0.3048965, 433.0: 0.3137873, 434.0: 0.3216454, 435.0: 0.3285, 436.0: 0.3343513, 437.0: 0.3392101, 438.0: 0.3431213, 439.0: 0.3461296, 440.0: 0.34828, 441.0: 0.3495999, 442.0: 0.3501474, 443.0: 0.350013, 444.0: 0.349287, 445.0: 0.34806, 446.0: 0.3463733, 447.0: 0.3442624, 448.0: 0.3418088, 449.0: 0.3390941, 450.0: 0.3362, 451.0: 0.3331977, 452.0: 0.3300411, 453.0: 0.3266357, 454.0: 0.3228868, 455.0: 0.3187, 456.0: 0.3140251, 457.0: 0.308884, 458.0: 0.3032904, 459.0: 0.2972579, 460.0: 0.2908, 461.0: 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819.0: 0.0, 820.0: 0.0, 821.0: 0.0, 822.0: 0.0, 823.0: 0.0, 824.0: 0.0, 825.0: 0.0, 826.0: 0.0, 827.0: 0.0, 828.0: 0.0, 829.0: 0.0, 830.0: 0.0}}, 'CIE 1931 2$^\circ$ Standard Observer'), illuminant=SpectralPowerDistribution( '1 Constant', {360.0: 1.0, 361.0: 1.0, 362.0: 1.0, 363.0: 1.0, 364.0: 1.0, 365.0: 1.0, 366.0: 1.0, 367.0: 1.0, 368.0: 1.0, 369.0: 1.0, 370.0: 1.0, 371.0: 1.0, 372.0: 1.0, 373.0: 1.0, 374.0: 1.0, 375.0: 1.0, 376.0: 1.0, 377.0: 1.0, 378.0: 1.0, 379.0: 1.0, 380.0: 1.0, 381.0: 1.0, 382.0: 1.0, 383.0: 1.0, 384.0: 1.0, 385.0: 1.0, 386.0: 1.0, 387.0: 1.0, 388.0: 1.0, 389.0: 1.0, 390.0: 1.0, 391.0: 1.0, 392.0: 1.0, 393.0: 1.0, 394.0: 1.0, 395.0: 1.0, 396.0: 1.0, 397.0: 1.0, 398.0: 1.0, 399.0: 1.0, 400.0: 1.0, 401.0: 1.0, 402.0: 1.0, 403.0: 1.0, 404.0: 1.0, 405.0: 1.0, 406.0: 1.0, 407.0: 1.0, 408.0: 1.0, 409.0: 1.0, 410.0: 1.0, 411.0: 1.0, 412.0: 1.0, 413.0: 1.0, 414.0: 1.0, 415.0: 1.0, 416.0: 1.0, 417.0: 1.0, 418.0: 1.0, 419.0: 1.0, 420.0: 1.0, 421.0: 1.0, 422.0: 1.0, 423.0: 1.0, 424.0: 1.0, 425.0: 1.0, 426.0: 1.0, 427.0: 1.0, 428.0: 1.0, 429.0: 1.0, 430.0: 1.0, 431.0: 1.0, 432.0: 1.0, 433.0: 1.0, 434.0: 1.0, 435.0: 1.0, 436.0: 1.0, 437.0: 1.0, 438.0: 1.0, 439.0: 1.0, 440.0: 1.0, 441.0: 1.0, 442.0: 1.0, 443.0: 1.0, 444.0: 1.0, 445.0: 1.0, 446.0: 1.0, 447.0: 1.0, 448.0: 1.0, 449.0: 1.0, 450.0: 1.0, 451.0: 1.0, 452.0: 1.0, 453.0: 1.0, 454.0: 1.0, 455.0: 1.0, 456.0: 1.0, 457.0: 1.0, 458.0: 1.0, 459.0: 1.0, 460.0: 1.0, 461.0: 1.0, 462.0: 1.0, 463.0: 1.0, 464.0: 1.0, 465.0: 1.0, 466.0: 1.0, 467.0: 1.0, 468.0: 1.0, 469.0: 1.0, 470.0: 1.0, 471.0: 1.0, 472.0: 1.0, 473.0: 1.0, 474.0: 1.0, 475.0: 1.0, 476.0: 1.0, 477.0: 1.0, 478.0: 1.0, 479.0: 1.0, 480.0: 1.0, 481.0: 1.0, 482.0: 1.0, 483.0: 1.0, 484.0: 1.0, 485.0: 1.0, 486.0: 1.0, 487.0: 1.0, 488.0: 1.0, 489.0: 1.0, 490.0: 1.0, 491.0: 1.0, 492.0: 1.0, 493.0: 1.0, 494.0: 1.0, 495.0: 1.0, 496.0: 1.0, 497.0: 1.0, 498.0: 1.0, 499.0: 1.0, 500.0: 1.0, 501.0: 1.0, 502.0: 1.0, 503.0: 1.0, 504.0: 1.0, 505.0: 1.0, 506.0: 1.0, 507.0: 1.0, 508.0: 1.0, 509.0: 1.0, 510.0: 1.0, 511.0: 1.0, 512.0: 1.0, 513.0: 1.0, 514.0: 1.0, 515.0: 1.0, 516.0: 1.0, 517.0: 1.0, 518.0: 1.0, 519.0: 1.0, 520.0: 1.0, 521.0: 1.0, 522.0: 1.0, 523.0: 1.0, 524.0: 1.0, 525.0: 1.0, 526.0: 1.0, 527.0: 1.0, 528.0: 1.0, 529.0: 1.0, 530.0: 1.0, 531.0: 1.0, 532.0: 1.0, 533.0: 1.0, 534.0: 1.0, 535.0: 1.0, 536.0: 1.0, 537.0: 1.0, 538.0: 1.0, 539.0: 1.0, 540.0: 1.0, 541.0: 1.0, 542.0: 1.0, 543.0: 1.0, 544.0: 1.0, 545.0: 1.0, 546.0: 1.0, 547.0: 1.0, 548.0: 1.0, 549.0: 1.0, 550.0: 1.0, 551.0: 1.0, 552.0: 1.0, 553.0: 1.0, 554.0: 1.0, 555.0: 1.0, 556.0: 1.0, 557.0: 1.0, 558.0: 1.0, 559.0: 1.0, 560.0: 1.0, 561.0: 1.0, 562.0: 1.0, 563.0: 1.0, 564.0: 1.0, 565.0: 1.0, 566.0: 1.0, 567.0: 1.0, 568.0: 1.0, 569.0: 1.0, 570.0: 1.0, 571.0: 1.0, 572.0: 1.0, 573.0: 1.0, 574.0: 1.0, 575.0: 1.0, 576.0: 1.0, 577.0: 1.0, 578.0: 1.0, 579.0: 1.0, 580.0: 1.0, 581.0: 1.0, 582.0: 1.0, 583.0: 1.0, 584.0: 1.0, 585.0: 1.0, 586.0: 1.0, 587.0: 1.0, 588.0: 1.0, 589.0: 1.0, 590.0: 1.0, 591.0: 1.0, 592.0: 1.0, 593.0: 1.0, 594.0: 1.0, 595.0: 1.0, 596.0: 1.0, 597.0: 1.0, 598.0: 1.0, 599.0: 1.0, 600.0: 1.0, 601.0: 1.0, 602.0: 1.0, 603.0: 1.0, 604.0: 1.0, 605.0: 1.0, 606.0: 1.0, 607.0: 1.0, 608.0: 1.0, 609.0: 1.0, 610.0: 1.0, 611.0: 1.0, 612.0: 1.0, 613.0: 1.0, 614.0: 1.0, 615.0: 1.0, 616.0: 1.0, 617.0: 1.0, 618.0: 1.0, 619.0: 1.0, 620.0: 1.0, 621.0: 1.0, 622.0: 1.0, 623.0: 1.0, 624.0: 1.0, 625.0: 1.0, 626.0: 1.0, 627.0: 1.0, 628.0: 1.0, 629.0: 1.0, 630.0: 1.0, 631.0: 1.0, 632.0: 1.0, 633.0: 1.0, 634.0: 1.0, 635.0: 1.0, 636.0: 1.0, 637.0: 1.0, 638.0: 1.0, 639.0: 1.0, 640.0: 1.0, 641.0: 1.0, 642.0: 1.0, 643.0: 1.0, 644.0: 1.0, 645.0: 1.0, 646.0: 1.0, 647.0: 1.0, 648.0: 1.0, 649.0: 1.0, 650.0: 1.0, 651.0: 1.0, 652.0: 1.0, 653.0: 1.0, 654.0: 1.0, 655.0: 1.0, 656.0: 1.0, 657.0: 1.0, 658.0: 1.0, 659.0: 1.0, 660.0: 1.0, 661.0: 1.0, 662.0: 1.0, 663.0: 1.0, 664.0: 1.0, 665.0: 1.0, 666.0: 1.0, 667.0: 1.0, 668.0: 1.0, 669.0: 1.0, 670.0: 1.0, 671.0: 1.0, 672.0: 1.0, 673.0: 1.0, 674.0: 1.0, 675.0: 1.0, 676.0: 1.0, 677.0: 1.0, 678.0: 1.0, 679.0: 1.0, 680.0: 1.0, 681.0: 1.0, 682.0: 1.0, 683.0: 1.0, 684.0: 1.0, 685.0: 1.0, 686.0: 1.0, 687.0: 1.0, 688.0: 1.0, 689.0: 1.0, 690.0: 1.0, 691.0: 1.0, 692.0: 1.0, 693.0: 1.0, 694.0: 1.0, 695.0: 1.0, 696.0: 1.0, 697.0: 1.0, 698.0: 1.0, 699.0: 1.0, 700.0: 1.0, 701.0: 1.0, 702.0: 1.0, 703.0: 1.0, 704.0: 1.0, 705.0: 1.0, 706.0: 1.0, 707.0: 1.0, 708.0: 1.0, 709.0: 1.0, 710.0: 1.0, 711.0: 1.0, 712.0: 1.0, 713.0: 1.0, 714.0: 1.0, 715.0: 1.0, 716.0: 1.0, 717.0: 1.0, 718.0: 1.0, 719.0: 1.0, 720.0: 1.0, 721.0: 1.0, 722.0: 1.0, 723.0: 1.0, 724.0: 1.0, 725.0: 1.0, 726.0: 1.0, 727.0: 1.0, 728.0: 1.0, 729.0: 1.0, 730.0: 1.0, 731.0: 1.0, 732.0: 1.0, 733.0: 1.0, 734.0: 1.0, 735.0: 1.0, 736.0: 1.0, 737.0: 1.0, 738.0: 1.0, 739.0: 1.0, 740.0: 1.0, 741.0: 1.0, 742.0: 1.0, 743.0: 1.0, 744.0: 1.0, 745.0: 1.0, 746.0: 1.0, 747.0: 1.0, 748.0: 1.0, 749.0: 1.0, 750.0: 1.0, 751.0: 1.0, 752.0: 1.0, 753.0: 1.0, 754.0: 1.0, 755.0: 1.0, 756.0: 1.0, 757.0: 1.0, 758.0: 1.0, 759.0: 1.0, 760.0: 1.0, 761.0: 1.0, 762.0: 1.0, 763.0: 1.0, 764.0: 1.0, 765.0: 1.0, 766.0: 1.0, 767.0: 1.0, 768.0: 1.0, 769.0: 1.0, 770.0: 1.0, 771.0: 1.0, 772.0: 1.0, 773.0: 1.0, 774.0: 1.0, 775.0: 1.0, 776.0: 1.0, 777.0: 1.0, 778.0: 1.0, 779.0: 1.0, 780.0: 1.0, 781.0: 1.0, 782.0: 1.0, 783.0: 1.0, 784.0: 1.0, 785.0: 1.0, 786.0: 1.0, 787.0: 1.0, 788.0: 1.0, 789.0: 1.0, 790.0: 1.0, 791.0: 1.0, 792.0: 1.0, 793.0: 1.0, 794.0: 1.0, 795.0: 1.0, 796.0: 1.0, 797.0: 1.0, 798.0: 1.0, 799.0: 1.0, 800.0: 1.0, 801.0: 1.0, 802.0: 1.0, 803.0: 1.0, 804.0: 1.0, 805.0: 1.0, 806.0: 1.0, 807.0: 1.0, 808.0: 1.0, 809.0: 1.0, 810.0: 1.0, 811.0: 1.0, 812.0: 1.0, 813.0: 1.0, 814.0: 1.0, 815.0: 1.0, 816.0: 1.0, 817.0: 1.0, 818.0: 1.0, 819.0: 1.0, 820.0: 1.0, 821.0: 1.0, 822.0: 1.0, 823.0: 1.0, 824.0: 1.0, 825.0: 1.0, 826.0: 1.0, 827.0: 1.0, 828.0: 1.0, 829.0: 1.0, 830.0: 1.0}))[source]¶

Converts given spectral power distribution to CIE XYZ tristimulus values using given colour matching functions and illuminant accordingly to classical integration method.

Parameters:	spd (SpectralPowerDistribution) – Spectral power distribution. cmfs (XYZ_ColourMatchingFunctions) – Standard observer colour matching functions. illuminant (SpectralPowerDistribution, optional) – Illuminant spectral power distribution.
Returns:	CIE XYZ tristimulus values.
Return type:	ndarray, (3,)

Warning

The output range of that definition is non standard!

Notes

Output CIE XYZ tristimulus values are in range [0, 100].

References

[3]	Wyszecki, G., & Stiles, W. S. (2000). Integration Replace by Summation. In Color Science: Concepts and Methods, Quantitative Data and Formulae (pp. 158–163). Wiley. ISBN:978-0471399186

Examples

>>> from colour import (
...     CMFS, ILLUMINANTS_RELATIVE_SPDS, SpectralPowerDistribution)
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> data = {
...     400: 0.0641,
...     420: 0.0645,
...     440: 0.0562,
...     460: 0.0537,
...     480: 0.0559,
...     500: 0.0651,
...     520: 0.0705,
...     540: 0.0772,
...     560: 0.0870,
...     580: 0.1128,
...     600: 0.1360,
...     620: 0.1511,
...     640: 0.1688,
...     660: 0.1996,
...     680: 0.2397,
...     700: 0.2852}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> illuminant = ILLUMINANTS_RELATIVE_SPDS['D50']
>>> spectral_to_XYZ_integration(  
...     spd, cmfs, illuminant)
array([ 11.5296285...,   9.9499467...,   4.7066079...])

colour.colorimetry.spectral_to_XYZ_tristimulus_weighting_factors_ASTME30815(spd, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 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421.0: 1.0, 422.0: 1.0, 423.0: 1.0, 424.0: 1.0, 425.0: 1.0, 426.0: 1.0, 427.0: 1.0, 428.0: 1.0, 429.0: 1.0, 430.0: 1.0, 431.0: 1.0, 432.0: 1.0, 433.0: 1.0, 434.0: 1.0, 435.0: 1.0, 436.0: 1.0, 437.0: 1.0, 438.0: 1.0, 439.0: 1.0, 440.0: 1.0, 441.0: 1.0, 442.0: 1.0, 443.0: 1.0, 444.0: 1.0, 445.0: 1.0, 446.0: 1.0, 447.0: 1.0, 448.0: 1.0, 449.0: 1.0, 450.0: 1.0, 451.0: 1.0, 452.0: 1.0, 453.0: 1.0, 454.0: 1.0, 455.0: 1.0, 456.0: 1.0, 457.0: 1.0, 458.0: 1.0, 459.0: 1.0, 460.0: 1.0, 461.0: 1.0, 462.0: 1.0, 463.0: 1.0, 464.0: 1.0, 465.0: 1.0, 466.0: 1.0, 467.0: 1.0, 468.0: 1.0, 469.0: 1.0, 470.0: 1.0, 471.0: 1.0, 472.0: 1.0, 473.0: 1.0, 474.0: 1.0, 475.0: 1.0, 476.0: 1.0, 477.0: 1.0, 478.0: 1.0, 479.0: 1.0, 480.0: 1.0, 481.0: 1.0, 482.0: 1.0, 483.0: 1.0, 484.0: 1.0, 485.0: 1.0, 486.0: 1.0, 487.0: 1.0, 488.0: 1.0, 489.0: 1.0, 490.0: 1.0, 491.0: 1.0, 492.0: 1.0, 493.0: 1.0, 494.0: 1.0, 495.0: 1.0, 496.0: 1.0, 497.0: 1.0, 498.0: 1.0, 499.0: 1.0, 500.0: 1.0, 501.0: 1.0, 502.0: 1.0, 503.0: 1.0, 504.0: 1.0, 505.0: 1.0, 506.0: 1.0, 507.0: 1.0, 508.0: 1.0, 509.0: 1.0, 510.0: 1.0, 511.0: 1.0, 512.0: 1.0, 513.0: 1.0, 514.0: 1.0, 515.0: 1.0, 516.0: 1.0, 517.0: 1.0, 518.0: 1.0, 519.0: 1.0, 520.0: 1.0, 521.0: 1.0, 522.0: 1.0, 523.0: 1.0, 524.0: 1.0, 525.0: 1.0, 526.0: 1.0, 527.0: 1.0, 528.0: 1.0, 529.0: 1.0, 530.0: 1.0, 531.0: 1.0, 532.0: 1.0, 533.0: 1.0, 534.0: 1.0, 535.0: 1.0, 536.0: 1.0, 537.0: 1.0, 538.0: 1.0, 539.0: 1.0, 540.0: 1.0, 541.0: 1.0, 542.0: 1.0, 543.0: 1.0, 544.0: 1.0, 545.0: 1.0, 546.0: 1.0, 547.0: 1.0, 548.0: 1.0, 549.0: 1.0, 550.0: 1.0, 551.0: 1.0, 552.0: 1.0, 553.0: 1.0, 554.0: 1.0, 555.0: 1.0, 556.0: 1.0, 557.0: 1.0, 558.0: 1.0, 559.0: 1.0, 560.0: 1.0, 561.0: 1.0, 562.0: 1.0, 563.0: 1.0, 564.0: 1.0, 565.0: 1.0, 566.0: 1.0, 567.0: 1.0, 568.0: 1.0, 569.0: 1.0, 570.0: 1.0, 571.0: 1.0, 572.0: 1.0, 573.0: 1.0, 574.0: 1.0, 575.0: 1.0, 576.0: 1.0, 577.0: 1.0, 578.0: 1.0, 579.0: 1.0, 580.0: 1.0, 581.0: 1.0, 582.0: 1.0, 583.0: 1.0, 584.0: 1.0, 585.0: 1.0, 586.0: 1.0, 587.0: 1.0, 588.0: 1.0, 589.0: 1.0, 590.0: 1.0, 591.0: 1.0, 592.0: 1.0, 593.0: 1.0, 594.0: 1.0, 595.0: 1.0, 596.0: 1.0, 597.0: 1.0, 598.0: 1.0, 599.0: 1.0, 600.0: 1.0, 601.0: 1.0, 602.0: 1.0, 603.0: 1.0, 604.0: 1.0, 605.0: 1.0, 606.0: 1.0, 607.0: 1.0, 608.0: 1.0, 609.0: 1.0, 610.0: 1.0, 611.0: 1.0, 612.0: 1.0, 613.0: 1.0, 614.0: 1.0, 615.0: 1.0, 616.0: 1.0, 617.0: 1.0, 618.0: 1.0, 619.0: 1.0, 620.0: 1.0, 621.0: 1.0, 622.0: 1.0, 623.0: 1.0, 624.0: 1.0, 625.0: 1.0, 626.0: 1.0, 627.0: 1.0, 628.0: 1.0, 629.0: 1.0, 630.0: 1.0, 631.0: 1.0, 632.0: 1.0, 633.0: 1.0, 634.0: 1.0, 635.0: 1.0, 636.0: 1.0, 637.0: 1.0, 638.0: 1.0, 639.0: 1.0, 640.0: 1.0, 641.0: 1.0, 642.0: 1.0, 643.0: 1.0, 644.0: 1.0, 645.0: 1.0, 646.0: 1.0, 647.0: 1.0, 648.0: 1.0, 649.0: 1.0, 650.0: 1.0, 651.0: 1.0, 652.0: 1.0, 653.0: 1.0, 654.0: 1.0, 655.0: 1.0, 656.0: 1.0, 657.0: 1.0, 658.0: 1.0, 659.0: 1.0, 660.0: 1.0, 661.0: 1.0, 662.0: 1.0, 663.0: 1.0, 664.0: 1.0, 665.0: 1.0, 666.0: 1.0, 667.0: 1.0, 668.0: 1.0, 669.0: 1.0, 670.0: 1.0, 671.0: 1.0, 672.0: 1.0, 673.0: 1.0, 674.0: 1.0, 675.0: 1.0, 676.0: 1.0, 677.0: 1.0, 678.0: 1.0, 679.0: 1.0, 680.0: 1.0, 681.0: 1.0, 682.0: 1.0, 683.0: 1.0, 684.0: 1.0, 685.0: 1.0, 686.0: 1.0, 687.0: 1.0, 688.0: 1.0, 689.0: 1.0, 690.0: 1.0, 691.0: 1.0, 692.0: 1.0, 693.0: 1.0, 694.0: 1.0, 695.0: 1.0, 696.0: 1.0, 697.0: 1.0, 698.0: 1.0, 699.0: 1.0, 700.0: 1.0, 701.0: 1.0, 702.0: 1.0, 703.0: 1.0, 704.0: 1.0, 705.0: 1.0, 706.0: 1.0, 707.0: 1.0, 708.0: 1.0, 709.0: 1.0, 710.0: 1.0, 711.0: 1.0, 712.0: 1.0, 713.0: 1.0, 714.0: 1.0, 715.0: 1.0, 716.0: 1.0, 717.0: 1.0, 718.0: 1.0, 719.0: 1.0, 720.0: 1.0, 721.0: 1.0, 722.0: 1.0, 723.0: 1.0, 724.0: 1.0, 725.0: 1.0, 726.0: 1.0, 727.0: 1.0, 728.0: 1.0, 729.0: 1.0, 730.0: 1.0, 731.0: 1.0, 732.0: 1.0, 733.0: 1.0, 734.0: 1.0, 735.0: 1.0, 736.0: 1.0, 737.0: 1.0, 738.0: 1.0, 739.0: 1.0, 740.0: 1.0, 741.0: 1.0, 742.0: 1.0, 743.0: 1.0, 744.0: 1.0, 745.0: 1.0, 746.0: 1.0, 747.0: 1.0, 748.0: 1.0, 749.0: 1.0, 750.0: 1.0, 751.0: 1.0, 752.0: 1.0, 753.0: 1.0, 754.0: 1.0, 755.0: 1.0, 756.0: 1.0, 757.0: 1.0, 758.0: 1.0, 759.0: 1.0, 760.0: 1.0, 761.0: 1.0, 762.0: 1.0, 763.0: 1.0, 764.0: 1.0, 765.0: 1.0, 766.0: 1.0, 767.0: 1.0, 768.0: 1.0, 769.0: 1.0, 770.0: 1.0, 771.0: 1.0, 772.0: 1.0, 773.0: 1.0, 774.0: 1.0, 775.0: 1.0, 776.0: 1.0, 777.0: 1.0, 778.0: 1.0, 779.0: 1.0, 780.0: 1.0}))[source]¶

Converts given spectral power distribution to CIE XYZ tristimulus values using given colour matching functions and illuminant using a table of tristimulus weighting factors accordingly to practise ASTM E308-15 method [2]_.

Parameters:	spd (SpectralPowerDistribution) – Spectral power distribution. cmfs (XYZ_ColourMatchingFunctions) – Standard observer colour matching functions. illuminant (SpectralPowerDistribution, optional) – Illuminant spectral power distribution.
Returns:	CIE XYZ tristimulus values.
Return type:	ndarray, (3,)

Warning

The output range of that definition is non standard!

Notes

Output CIE XYZ tristimulus values are in range [0, 100].

Examples

>>> from colour import (
...     CMFS, ILLUMINANTS_RELATIVE_SPDS, SpectralPowerDistribution)
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> data = {
...     400: 0.0641,
...     420: 0.0645,
...     440: 0.0562,
...     460: 0.0537,
...     480: 0.0559,
...     500: 0.0651,
...     520: 0.0705,
...     540: 0.0772,
...     560: 0.0870,
...     580: 0.1128,
...     600: 0.1360,
...     620: 0.1511,
...     640: 0.1688,
...     660: 0.1996,
...     680: 0.2397,
...     700: 0.2852}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> illuminant = ILLUMINANTS_RELATIVE_SPDS['D50']
>>> spectral_to_XYZ_tristimulus_weighting_factors_ASTME30815(
...     spd, cmfs, illuminant)  
array([ 11.5296311...,   9.9505845...,   4.7098037...])

colour.colorimetry.spectral_to_XYZ_ASTME30815(spd, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 403.0: 0.01878122, 404.0: 0.02074801, 405.0: 0.02319, 406.0: 0.02620736, 407.0: 0.02978248, 408.0: 0.03388092, 409.0: 0.03846824, 410.0: 0.04351, 411.0: 0.0489956, 412.0: 0.0550226, 413.0: 0.0617188, 414.0: 0.069212, 415.0: 0.07763, 416.0: 0.08695811, 417.0: 0.09717672, 418.0: 0.1084063, 419.0: 0.1207672, 420.0: 0.13438, 421.0: 0.1493582, 422.0: 0.1653957, 423.0: 0.1819831, 424.0: 0.198611, 425.0: 0.21477, 426.0: 0.2301868, 427.0: 0.2448797, 428.0: 0.2587773, 429.0: 0.2718079, 430.0: 0.2839, 431.0: 0.2949438, 432.0: 0.3048965, 433.0: 0.3137873, 434.0: 0.3216454, 435.0: 0.3285, 436.0: 0.3343513, 437.0: 0.3392101, 438.0: 0.3431213, 439.0: 0.3461296, 440.0: 0.34828, 441.0: 0.3495999, 442.0: 0.3501474, 443.0: 0.350013, 444.0: 0.349287, 445.0: 0.34806, 446.0: 0.3463733, 447.0: 0.3442624, 448.0: 0.3418088, 449.0: 0.3390941, 450.0: 0.3362, 451.0: 0.3331977, 452.0: 0.3300411, 453.0: 0.3266357, 454.0: 0.3228868, 455.0: 0.3187, 456.0: 0.3140251, 457.0: 0.308884, 458.0: 0.3032904, 459.0: 0.2972579, 460.0: 0.2908, 461.0: 0.2839701, 462.0: 0.2767214, 463.0: 0.2689178, 464.0: 0.2604227, 465.0: 0.2511, 466.0: 0.2408475, 467.0: 0.2298512, 468.0: 0.2184072, 469.0: 0.2068115, 470.0: 0.19536, 471.0: 0.1842136, 472.0: 0.1733273, 473.0: 0.1626881, 474.0: 0.1522833, 475.0: 0.1421, 476.0: 0.1321786, 477.0: 0.1225696, 478.0: 0.1132752, 479.0: 0.1042979, 480.0: 0.09564, 481.0: 0.08729955, 482.0: 0.07930804, 483.0: 0.07171776, 484.0: 0.06458099, 485.0: 0.05795001, 486.0: 0.05186211, 487.0: 0.04628152, 488.0: 0.04115088, 489.0: 0.03641283, 490.0: 0.03201, 491.0: 0.0279172, 492.0: 0.0241444, 493.0: 0.020687, 494.0: 0.0175404, 495.0: 0.0147, 496.0: 0.01216179, 497.0: 0.00991996, 498.0: 0.00796724, 499.0: 0.006296346, 500.0: 0.0049, 501.0: 0.003777173, 502.0: 0.00294532, 503.0: 0.00242488, 504.0: 0.002236293, 505.0: 0.0024, 506.0: 0.00292552, 507.0: 0.00383656, 508.0: 0.00517484, 509.0: 0.00698208, 510.0: 0.0093, 511.0: 0.01214949, 512.0: 0.01553588, 513.0: 0.01947752, 514.0: 0.02399277, 515.0: 0.0291, 516.0: 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506.0: 1.0, 507.0: 1.0, 508.0: 1.0, 509.0: 1.0, 510.0: 1.0, 511.0: 1.0, 512.0: 1.0, 513.0: 1.0, 514.0: 1.0, 515.0: 1.0, 516.0: 1.0, 517.0: 1.0, 518.0: 1.0, 519.0: 1.0, 520.0: 1.0, 521.0: 1.0, 522.0: 1.0, 523.0: 1.0, 524.0: 1.0, 525.0: 1.0, 526.0: 1.0, 527.0: 1.0, 528.0: 1.0, 529.0: 1.0, 530.0: 1.0, 531.0: 1.0, 532.0: 1.0, 533.0: 1.0, 534.0: 1.0, 535.0: 1.0, 536.0: 1.0, 537.0: 1.0, 538.0: 1.0, 539.0: 1.0, 540.0: 1.0, 541.0: 1.0, 542.0: 1.0, 543.0: 1.0, 544.0: 1.0, 545.0: 1.0, 546.0: 1.0, 547.0: 1.0, 548.0: 1.0, 549.0: 1.0, 550.0: 1.0, 551.0: 1.0, 552.0: 1.0, 553.0: 1.0, 554.0: 1.0, 555.0: 1.0, 556.0: 1.0, 557.0: 1.0, 558.0: 1.0, 559.0: 1.0, 560.0: 1.0, 561.0: 1.0, 562.0: 1.0, 563.0: 1.0, 564.0: 1.0, 565.0: 1.0, 566.0: 1.0, 567.0: 1.0, 568.0: 1.0, 569.0: 1.0, 570.0: 1.0, 571.0: 1.0, 572.0: 1.0, 573.0: 1.0, 574.0: 1.0, 575.0: 1.0, 576.0: 1.0, 577.0: 1.0, 578.0: 1.0, 579.0: 1.0, 580.0: 1.0, 581.0: 1.0, 582.0: 1.0, 583.0: 1.0, 584.0: 1.0, 585.0: 1.0, 586.0: 1.0, 587.0: 1.0, 588.0: 1.0, 589.0: 1.0, 590.0: 1.0, 591.0: 1.0, 592.0: 1.0, 593.0: 1.0, 594.0: 1.0, 595.0: 1.0, 596.0: 1.0, 597.0: 1.0, 598.0: 1.0, 599.0: 1.0, 600.0: 1.0, 601.0: 1.0, 602.0: 1.0, 603.0: 1.0, 604.0: 1.0, 605.0: 1.0, 606.0: 1.0, 607.0: 1.0, 608.0: 1.0, 609.0: 1.0, 610.0: 1.0, 611.0: 1.0, 612.0: 1.0, 613.0: 1.0, 614.0: 1.0, 615.0: 1.0, 616.0: 1.0, 617.0: 1.0, 618.0: 1.0, 619.0: 1.0, 620.0: 1.0, 621.0: 1.0, 622.0: 1.0, 623.0: 1.0, 624.0: 1.0, 625.0: 1.0, 626.0: 1.0, 627.0: 1.0, 628.0: 1.0, 629.0: 1.0, 630.0: 1.0, 631.0: 1.0, 632.0: 1.0, 633.0: 1.0, 634.0: 1.0, 635.0: 1.0, 636.0: 1.0, 637.0: 1.0, 638.0: 1.0, 639.0: 1.0, 640.0: 1.0, 641.0: 1.0, 642.0: 1.0, 643.0: 1.0, 644.0: 1.0, 645.0: 1.0, 646.0: 1.0, 647.0: 1.0, 648.0: 1.0, 649.0: 1.0, 650.0: 1.0, 651.0: 1.0, 652.0: 1.0, 653.0: 1.0, 654.0: 1.0, 655.0: 1.0, 656.0: 1.0, 657.0: 1.0, 658.0: 1.0, 659.0: 1.0, 660.0: 1.0, 661.0: 1.0, 662.0: 1.0, 663.0: 1.0, 664.0: 1.0, 665.0: 1.0, 666.0: 1.0, 667.0: 1.0, 668.0: 1.0, 669.0: 1.0, 670.0: 1.0, 671.0: 1.0, 672.0: 1.0, 673.0: 1.0, 674.0: 1.0, 675.0: 1.0, 676.0: 1.0, 677.0: 1.0, 678.0: 1.0, 679.0: 1.0, 680.0: 1.0, 681.0: 1.0, 682.0: 1.0, 683.0: 1.0, 684.0: 1.0, 685.0: 1.0, 686.0: 1.0, 687.0: 1.0, 688.0: 1.0, 689.0: 1.0, 690.0: 1.0, 691.0: 1.0, 692.0: 1.0, 693.0: 1.0, 694.0: 1.0, 695.0: 1.0, 696.0: 1.0, 697.0: 1.0, 698.0: 1.0, 699.0: 1.0, 700.0: 1.0, 701.0: 1.0, 702.0: 1.0, 703.0: 1.0, 704.0: 1.0, 705.0: 1.0, 706.0: 1.0, 707.0: 1.0, 708.0: 1.0, 709.0: 1.0, 710.0: 1.0, 711.0: 1.0, 712.0: 1.0, 713.0: 1.0, 714.0: 1.0, 715.0: 1.0, 716.0: 1.0, 717.0: 1.0, 718.0: 1.0, 719.0: 1.0, 720.0: 1.0, 721.0: 1.0, 722.0: 1.0, 723.0: 1.0, 724.0: 1.0, 725.0: 1.0, 726.0: 1.0, 727.0: 1.0, 728.0: 1.0, 729.0: 1.0, 730.0: 1.0, 731.0: 1.0, 732.0: 1.0, 733.0: 1.0, 734.0: 1.0, 735.0: 1.0, 736.0: 1.0, 737.0: 1.0, 738.0: 1.0, 739.0: 1.0, 740.0: 1.0, 741.0: 1.0, 742.0: 1.0, 743.0: 1.0, 744.0: 1.0, 745.0: 1.0, 746.0: 1.0, 747.0: 1.0, 748.0: 1.0, 749.0: 1.0, 750.0: 1.0, 751.0: 1.0, 752.0: 1.0, 753.0: 1.0, 754.0: 1.0, 755.0: 1.0, 756.0: 1.0, 757.0: 1.0, 758.0: 1.0, 759.0: 1.0, 760.0: 1.0, 761.0: 1.0, 762.0: 1.0, 763.0: 1.0, 764.0: 1.0, 765.0: 1.0, 766.0: 1.0, 767.0: 1.0, 768.0: 1.0, 769.0: 1.0, 770.0: 1.0, 771.0: 1.0, 772.0: 1.0, 773.0: 1.0, 774.0: 1.0, 775.0: 1.0, 776.0: 1.0, 777.0: 1.0, 778.0: 1.0, 779.0: 1.0, 780.0: 1.0}), use_practice_range=True, mi_5nm_omission_method=True, mi_20nm_interpolation_method=True)[source]¶

Converts given spectral power distribution to CIE XYZ tristimulus values using given colour matching functions and illuminant accordingly to practise ASTM E308-15 method [2]_.

Parameters:	spd (SpectralPowerDistribution) – Spectral power distribution. cmfs (XYZ_ColourMatchingFunctions) – Standard observer colour matching functions. illuminant (SpectralPowerDistribution, optional) – Illuminant spectral power distribution. use_practice_range (bool, optional) – Practise ASTM E308-15 working wavelengths range is [360, 780], if True this argument will trim the colour matching functions appropriately. mi_5nm_omission_method (bool, optional) – 5 nm measurement intervals spectral power distribution conversion to tristimulus values will use a 5 nm version of the colour matching functions instead of a table of tristimulus weighting factors. mi_20nm_interpolation_method (bool, optional) – 20 nm measurement intervals spectral power distribution conversion to tristimulus values will use a dedicated interpolation method instead of a table of tristimulus weighting factors.
Returns:	CIE XYZ tristimulus values.
Return type:	ndarray, (3,)

Warning

The tables of tristimulus weighting factors are cached in _TRISTIMULUS_WEIGHTING_FACTORS_CACHE attribute. Their identifier key is defined by the colour matching functions and illuminant names along the current shape such as: CIE 1964 10 Degree Standard Observer, A, (360.0, 830.0, 10.0) Considering the above, one should be mindful that using similar colour matching functions and illuminant names but with different spectral data will lead to unexpected behaviour.
The output range of that definition is non standard!

Notes

Output CIE XYZ tristimulus values are in range [0, 100].

Examples

>>> from colour import (
...     CMFS, ILLUMINANTS_RELATIVE_SPDS, SpectralPowerDistribution)
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> data = {
...     400: 0.0641,
...     420: 0.0645,
...     440: 0.0562,
...     460: 0.0537,
...     480: 0.0559,
...     500: 0.0651,
...     520: 0.0705,
...     540: 0.0772,
...     560: 0.0870,
...     580: 0.1128,
...     600: 0.1360,
...     620: 0.1511,
...     640: 0.1688,
...     660: 0.1996,
...     680: 0.2397,
...     700: 0.2852}
>>> spd = SpectralPowerDistribution('Sample', data)
>>> illuminant = ILLUMINANTS_RELATIVE_SPDS['D50']
>>> spectral_to_XYZ_ASTME30815(
...     spd, cmfs, illuminant)  
array([ 11.5290265...,   9.9502091...,   4.7098882...])

colour.colorimetry.wavelength_to_XYZ(wavelength, cmfs=XYZ_ColourMatchingFunctions( 'CIE 1931 2 Degree Standard Observer', {u'x_bar': {360.0: 0.0001299, 361.0: 0.000145847, 362.0: 0.0001638021, 363.0: 0.0001840037, 364.0: 0.0002066902, 365.0: 0.0002321, 366.0: 0.000260728, 367.0: 0.000293075, 368.0: 0.000329388, 369.0: 0.000369914, 370.0: 0.0004149, 371.0: 0.0004641587, 372.0: 0.000518986, 373.0: 0.000581854, 374.0: 0.0006552347, 375.0: 0.0007416, 376.0: 0.0008450296, 377.0: 0.0009645268, 378.0: 0.001094949, 379.0: 0.001231154, 380.0: 0.001368, 381.0: 0.00150205, 382.0: 0.001642328, 383.0: 0.001802382, 384.0: 0.001995757, 385.0: 0.002236, 386.0: 0.002535385, 387.0: 0.002892603, 388.0: 0.003300829, 389.0: 0.003753236, 390.0: 0.004243, 391.0: 0.004762389, 392.0: 0.005330048, 393.0: 0.005978712, 394.0: 0.006741117, 395.0: 0.00765, 396.0: 0.008751373, 397.0: 0.01002888, 398.0: 0.0114217, 399.0: 0.01286901, 400.0: 0.01431, 401.0: 0.01570443, 402.0: 0.01714744, 403.0: 0.01878122, 404.0: 0.02074801, 405.0: 0.02319, 406.0: 0.02620736, 407.0: 0.02978248, 408.0: 0.03388092, 409.0: 0.03846824, 410.0: 0.04351, 411.0: 0.0489956, 412.0: 0.0550226, 413.0: 0.0617188, 414.0: 0.069212, 415.0: 0.07763, 416.0: 0.08695811, 417.0: 0.09717672, 418.0: 0.1084063, 419.0: 0.1207672, 420.0: 0.13438, 421.0: 0.1493582, 422.0: 0.1653957, 423.0: 0.1819831, 424.0: 0.198611, 425.0: 0.21477, 426.0: 0.2301868, 427.0: 0.2448797, 428.0: 0.2587773, 429.0: 0.2718079, 430.0: 0.2839, 431.0: 0.2949438, 432.0: 0.3048965, 433.0: 0.3137873, 434.0: 0.3216454, 435.0: 0.3285, 436.0: 0.3343513, 437.0: 0.3392101, 438.0: 0.3431213, 439.0: 0.3461296, 440.0: 0.34828, 441.0: 0.3495999, 442.0: 0.3501474, 443.0: 0.350013, 444.0: 0.349287, 445.0: 0.34806, 446.0: 0.3463733, 447.0: 0.3442624, 448.0: 0.3418088, 449.0: 0.3390941, 450.0: 0.3362, 451.0: 0.3331977, 452.0: 0.3300411, 453.0: 0.3266357, 454.0: 0.3228868, 455.0: 0.3187, 456.0: 0.3140251, 457.0: 0.308884, 458.0: 0.3032904, 459.0: 0.2972579, 460.0: 0.2908, 461.0: 0.2839701, 462.0: 0.2767214, 463.0: 0.2689178, 464.0: 0.2604227, 465.0: 0.2511, 466.0: 0.2408475, 467.0: 0.2298512, 468.0: 0.2184072, 469.0: 0.2068115, 470.0: 0.19536, 471.0: 0.1842136, 472.0: 0.1733273, 473.0: 0.1626881, 474.0: 0.1522833, 475.0: 0.1421, 476.0: 0.1321786, 477.0: 0.1225696, 478.0: 0.1132752, 479.0: 0.1042979, 480.0: 0.09564, 481.0: 0.08729955, 482.0: 0.07930804, 483.0: 0.07171776, 484.0: 0.06458099, 485.0: 0.05795001, 486.0: 0.05186211, 487.0: 0.04628152, 488.0: 0.04115088, 489.0: 0.03641283, 490.0: 0.03201, 491.0: 0.0279172, 492.0: 0.0241444, 493.0: 0.020687, 494.0: 0.0175404, 495.0: 0.0147, 496.0: 0.01216179, 497.0: 0.00991996, 498.0: 0.00796724, 499.0: 0.006296346, 500.0: 0.0049, 501.0: 0.003777173, 502.0: 0.00294532, 503.0: 0.00242488, 504.0: 0.002236293, 505.0: 0.0024, 506.0: 0.00292552, 507.0: 0.00383656, 508.0: 0.00517484, 509.0: 0.00698208, 510.0: 0.0093, 511.0: 0.01214949, 512.0: 0.01553588, 513.0: 0.01947752, 514.0: 0.02399277, 515.0: 0.0291, 516.0: 0.03481485, 517.0: 0.04112016, 518.0: 0.04798504, 519.0: 0.05537861, 520.0: 0.06327, 521.0: 0.07163501, 522.0: 0.08046224, 523.0: 0.08973996, 524.0: 0.09945645, 525.0: 0.1096, 526.0: 0.1201674, 527.0: 0.1311145, 528.0: 0.1423679, 529.0: 0.1538542, 530.0: 0.1655, 531.0: 0.1772571, 532.0: 0.18914, 533.0: 0.2011694, 534.0: 0.2133658, 535.0: 0.2257499, 536.0: 0.2383209, 537.0: 0.2510668, 538.0: 0.2639922, 539.0: 0.2771017, 540.0: 0.2904, 541.0: 0.3038912, 542.0: 0.3175726, 543.0: 0.3314384, 544.0: 0.3454828, 545.0: 0.3597, 546.0: 0.3740839, 547.0: 0.3886396, 548.0: 0.4033784, 549.0: 0.4183115, 550.0: 0.4334499, 551.0: 0.4487953, 552.0: 0.464336, 553.0: 0.480064, 554.0: 0.4959713, 555.0: 0.5120501, 556.0: 0.5282959, 557.0: 0.5446916, 558.0: 0.5612094, 559.0: 0.5778215, 560.0: 0.5945, 561.0: 0.6112209, 562.0: 0.6279758, 563.0: 0.6447602, 564.0: 0.6615697, 565.0: 0.6784, 566.0: 0.6952392, 567.0: 0.7120586, 568.0: 0.7288284, 569.0: 0.7455188, 570.0: 0.7621, 571.0: 0.7785432, 572.0: 0.7948256, 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797.0: 4.56972e-06, 798.0: 4.260194e-06, 799.0: 3.971739e-06, 800.0: 3.7029e-06, 801.0: 3.452163e-06, 802.0: 3.218302e-06, 803.0: 3.0003e-06, 804.0: 2.797139e-06, 805.0: 2.6078e-06, 806.0: 2.43122e-06, 807.0: 2.266531e-06, 808.0: 2.113013e-06, 809.0: 1.969943e-06, 810.0: 1.8366e-06, 811.0: 1.71223e-06, 812.0: 1.596228e-06, 813.0: 1.48809e-06, 814.0: 1.387314e-06, 815.0: 1.2934e-06, 816.0: 1.20582e-06, 817.0: 1.124143e-06, 818.0: 1.048009e-06, 819.0: 9.77058e-07, 820.0: 9.1093e-07, 821.0: 8.49251e-07, 822.0: 7.91721e-07, 823.0: 7.3809e-07, 824.0: 6.8811e-07, 825.0: 6.4153e-07, 826.0: 5.9809e-07, 827.0: 5.57575e-07, 828.0: 5.19808e-07, 829.0: 4.84612e-07, 830.0: 4.5181e-07}, u'z_bar': {360.0: 0.0006061, 361.0: 0.0006808792, 362.0: 0.0007651456, 363.0: 0.0008600124, 364.0: 0.0009665928, 365.0: 0.001086, 366.0: 0.001220586, 367.0: 0.001372729, 368.0: 0.001543579, 369.0: 0.001734286, 370.0: 0.001946, 371.0: 0.002177777, 372.0: 0.002435809, 373.0: 0.002731953, 374.0: 0.003078064, 375.0: 0.003486, 376.0: 0.003975227, 377.0: 0.00454088, 378.0: 0.00515832, 379.0: 0.005802907, 380.0: 0.006450001, 381.0: 0.007083216, 382.0: 0.007745488, 383.0: 0.008501152, 384.0: 0.009414544, 385.0: 0.01054999, 386.0: 0.0119658, 387.0: 0.01365587, 388.0: 0.01558805, 389.0: 0.01773015, 390.0: 0.02005001, 391.0: 0.02251136, 392.0: 0.02520288, 393.0: 0.02827972, 394.0: 0.03189704, 395.0: 0.03621, 396.0: 0.04143771, 397.0: 0.04750372, 398.0: 0.05411988, 399.0: 0.06099803, 400.0: 0.06785001, 401.0: 0.07448632, 402.0: 0.08136156, 403.0: 0.08915364, 404.0: 0.09854048, 405.0: 0.1102, 406.0: 0.1246133, 407.0: 0.1417017, 408.0: 0.1613035, 409.0: 0.1832568, 410.0: 0.2074, 411.0: 0.2336921, 412.0: 0.2626114, 413.0: 0.2947746, 414.0: 0.3307985, 415.0: 0.3713, 416.0: 0.4162091, 417.0: 0.4654642, 418.0: 0.5196948, 419.0: 0.5795303, 420.0: 0.6456, 421.0: 0.7184838, 422.0: 0.7967133, 423.0: 0.8778459, 424.0: 0.959439, 425.0: 1.0390501, 426.0: 1.1153673, 427.0: 1.1884971, 428.0: 1.2581233, 429.0: 1.3239296, 430.0: 1.3856, 431.0: 1.4426352, 432.0: 1.4948035, 433.0: 1.5421903, 434.0: 1.5848807, 435.0: 1.62296, 436.0: 1.6564048, 437.0: 1.6852959, 438.0: 1.7098745, 439.0: 1.7303821, 440.0: 1.74706, 441.0: 1.7600446, 442.0: 1.7696233, 443.0: 1.7762637, 444.0: 1.7804334, 445.0: 1.7826, 446.0: 1.7829682, 447.0: 1.7816998, 448.0: 1.7791982, 449.0: 1.7758671, 450.0: 1.77211, 451.0: 1.7682589, 452.0: 1.764039, 453.0: 1.7589438, 454.0: 1.7524663, 455.0: 1.7441, 456.0: 1.7335595, 457.0: 1.7208581, 458.0: 1.7059369, 459.0: 1.6887372, 460.0: 1.6692, 461.0: 1.6475287, 462.0: 1.6234127, 463.0: 1.5960223, 464.0: 1.564528, 465.0: 1.5281, 466.0: 1.4861114, 467.0: 1.4395215, 468.0: 1.3898799, 469.0: 1.3387362, 470.0: 1.28764, 471.0: 1.2374223, 472.0: 1.1878243, 473.0: 1.1387611, 474.0: 1.090148, 475.0: 1.0419, 476.0: 0.9941976, 477.0: 0.9473473, 478.0: 0.9014531, 479.0: 0.8566193, 480.0: 0.8129501, 481.0: 0.7705173, 482.0: 0.7294448, 483.0: 0.6899136, 484.0: 0.6521049, 485.0: 0.6162, 486.0: 0.5823286, 487.0: 0.5504162, 488.0: 0.5203376, 489.0: 0.4919673, 490.0: 0.46518, 491.0: 0.4399246, 492.0: 0.4161836, 493.0: 0.3938822, 494.0: 0.3729459, 495.0: 0.3533, 496.0: 0.3348578, 497.0: 0.3175521, 498.0: 0.3013375, 499.0: 0.2861686, 500.0: 0.272, 501.0: 0.2588171, 502.0: 0.2464838, 503.0: 0.2347718, 504.0: 0.2234533, 505.0: 0.2123, 506.0: 0.2011692, 507.0: 0.1901196, 508.0: 0.1792254, 509.0: 0.1685608, 510.0: 0.1582, 511.0: 0.1481383, 512.0: 0.1383758, 513.0: 0.1289942, 514.0: 0.1200751, 515.0: 0.1117, 516.0: 0.1039048, 517.0: 0.09666748, 518.0: 0.08998272, 519.0: 0.08384531, 520.0: 0.07824999, 521.0: 0.07320899, 522.0: 0.06867816, 523.0: 0.06456784, 524.0: 0.06078835, 525.0: 0.05725001, 526.0: 0.05390435, 527.0: 0.05074664, 528.0: 0.04775276, 529.0: 0.04489859, 530.0: 0.04216, 531.0: 0.03950728, 532.0: 0.03693564, 533.0: 0.03445836, 534.0: 0.03208872, 535.0: 0.02984, 536.0: 0.02771181, 537.0: 0.02569444, 538.0: 0.02378716, 539.0: 0.02198925, 540.0: 0.0203, 541.0: 0.01871805, 542.0: 0.01724036, 543.0: 0.01586364, 544.0: 0.01458461, 545.0: 0.0134, 546.0: 0.01230723, 547.0: 0.01130188, 548.0: 0.01037792, 549.0: 0.009529306, 550.0: 0.008749999, 551.0: 0.0080352, 552.0: 0.0073816, 553.0: 0.0067854, 554.0: 0.0062428, 555.0: 0.005749999, 556.0: 0.0053036, 557.0: 0.0048998, 558.0: 0.0045342, 559.0: 0.0042024, 560.0: 0.0039, 561.0: 0.0036232, 562.0: 0.0033706, 563.0: 0.0031414, 564.0: 0.0029348, 565.0: 0.002749999, 566.0: 0.0025852, 567.0: 0.0024386, 568.0: 0.0023094, 569.0: 0.0021968, 570.0: 0.0021, 571.0: 0.002017733, 572.0: 0.0019482, 573.0: 0.0018898, 574.0: 0.001840933, 575.0: 0.0018, 576.0: 0.001766267, 577.0: 0.0017378, 578.0: 0.0017112, 579.0: 0.001683067, 580.0: 0.001650001, 581.0: 0.001610133, 582.0: 0.0015644, 583.0: 0.0015136, 584.0: 0.001458533, 585.0: 0.0014, 586.0: 0.001336667, 587.0: 0.00127, 588.0: 0.001205, 589.0: 0.001146667, 590.0: 0.0011, 591.0: 0.0010688, 592.0: 0.0010494, 593.0: 0.0010356, 594.0: 0.0010212, 595.0: 0.001, 596.0: 0.00096864, 597.0: 0.00092992, 598.0: 0.00088688, 599.0: 0.00084256, 600.0: 0.0008, 601.0: 0.00076096, 602.0: 0.00072368, 603.0: 0.00068592, 604.0: 0.00064544, 605.0: 0.0006, 606.0: 0.0005478667, 607.0: 0.0004916, 608.0: 0.0004354, 609.0: 0.0003834667, 610.0: 0.00034, 611.0: 0.0003072533, 612.0: 0.00028316, 613.0: 0.00026544, 614.0: 0.0002518133, 615.0: 0.00024, 616.0: 0.0002295467, 617.0: 0.00022064, 618.0: 0.00021196, 619.0: 0.0002021867, 620.0: 0.00019, 621.0: 0.0001742133, 622.0: 0.00015564, 623.0: 0.00013596, 624.0: 0.0001168533, 625.0: 0.0001, 626.0: 8.613333e-05, 627.0: 7.46e-05, 628.0: 6.5e-05, 629.0: 5.693333e-05, 630.0: 4.999999e-05, 631.0: 4.416e-05, 632.0: 3.948e-05, 633.0: 3.572e-05, 634.0: 3.264e-05, 635.0: 3e-05, 636.0: 2.765333e-05, 637.0: 2.556e-05, 638.0: 2.364e-05, 639.0: 2.181333e-05, 640.0: 2e-05, 641.0: 1.813333e-05, 642.0: 1.62e-05, 643.0: 1.42e-05, 644.0: 1.213333e-05, 645.0: 1e-05, 646.0: 7.733333e-06, 647.0: 5.4e-06, 648.0: 3.2e-06, 649.0: 1.333333e-06, 650.0: 0.0, 651.0: 0.0, 652.0: 0.0, 653.0: 0.0, 654.0: 0.0, 655.0: 0.0, 656.0: 0.0, 657.0: 0.0, 658.0: 0.0, 659.0: 0.0, 660.0: 0.0, 661.0: 0.0, 662.0: 0.0, 663.0: 0.0, 664.0: 0.0, 665.0: 0.0, 666.0: 0.0, 667.0: 0.0, 668.0: 0.0, 669.0: 0.0, 670.0: 0.0, 671.0: 0.0, 672.0: 0.0, 673.0: 0.0, 674.0: 0.0, 675.0: 0.0, 676.0: 0.0, 677.0: 0.0, 678.0: 0.0, 679.0: 0.0, 680.0: 0.0, 681.0: 0.0, 682.0: 0.0, 683.0: 0.0, 684.0: 0.0, 685.0: 0.0, 686.0: 0.0, 687.0: 0.0, 688.0: 0.0, 689.0: 0.0, 690.0: 0.0, 691.0: 0.0, 692.0: 0.0, 693.0: 0.0, 694.0: 0.0, 695.0: 0.0, 696.0: 0.0, 697.0: 0.0, 698.0: 0.0, 699.0: 0.0, 700.0: 0.0, 701.0: 0.0, 702.0: 0.0, 703.0: 0.0, 704.0: 0.0, 705.0: 0.0, 706.0: 0.0, 707.0: 0.0, 708.0: 0.0, 709.0: 0.0, 710.0: 0.0, 711.0: 0.0, 712.0: 0.0, 713.0: 0.0, 714.0: 0.0, 715.0: 0.0, 716.0: 0.0, 717.0: 0.0, 718.0: 0.0, 719.0: 0.0, 720.0: 0.0, 721.0: 0.0, 722.0: 0.0, 723.0: 0.0, 724.0: 0.0, 725.0: 0.0, 726.0: 0.0, 727.0: 0.0, 728.0: 0.0, 729.0: 0.0, 730.0: 0.0, 731.0: 0.0, 732.0: 0.0, 733.0: 0.0, 734.0: 0.0, 735.0: 0.0, 736.0: 0.0, 737.0: 0.0, 738.0: 0.0, 739.0: 0.0, 740.0: 0.0, 741.0: 0.0, 742.0: 0.0, 743.0: 0.0, 744.0: 0.0, 745.0: 0.0, 746.0: 0.0, 747.0: 0.0, 748.0: 0.0, 749.0: 0.0, 750.0: 0.0, 751.0: 0.0, 752.0: 0.0, 753.0: 0.0, 754.0: 0.0, 755.0: 0.0, 756.0: 0.0, 757.0: 0.0, 758.0: 0.0, 759.0: 0.0, 760.0: 0.0, 761.0: 0.0, 762.0: 0.0, 763.0: 0.0, 764.0: 0.0, 765.0: 0.0, 766.0: 0.0, 767.0: 0.0, 768.0: 0.0, 769.0: 0.0, 770.0: 0.0, 771.0: 0.0, 772.0: 0.0, 773.0: 0.0, 774.0: 0.0, 775.0: 0.0, 776.0: 0.0, 777.0: 0.0, 778.0: 0.0, 779.0: 0.0, 780.0: 0.0, 781.0: 0.0, 782.0: 0.0, 783.0: 0.0, 784.0: 0.0, 785.0: 0.0, 786.0: 0.0, 787.0: 0.0, 788.0: 0.0, 789.0: 0.0, 790.0: 0.0, 791.0: 0.0, 792.0: 0.0, 793.0: 0.0, 794.0: 0.0, 795.0: 0.0, 796.0: 0.0, 797.0: 0.0, 798.0: 0.0, 799.0: 0.0, 800.0: 0.0, 801.0: 0.0, 802.0: 0.0, 803.0: 0.0, 804.0: 0.0, 805.0: 0.0, 806.0: 0.0, 807.0: 0.0, 808.0: 0.0, 809.0: 0.0, 810.0: 0.0, 811.0: 0.0, 812.0: 0.0, 813.0: 0.0, 814.0: 0.0, 815.0: 0.0, 816.0: 0.0, 817.0: 0.0, 818.0: 0.0, 819.0: 0.0, 820.0: 0.0, 821.0: 0.0, 822.0: 0.0, 823.0: 0.0, 824.0: 0.0, 825.0: 0.0, 826.0: 0.0, 827.0: 0.0, 828.0: 0.0, 829.0: 0.0, 830.0: 0.0}}, 'CIE 1931 2$^\circ$ Standard Observer'), method=None)[source]¶

Converts given wavelength $\lambda$ to CIE XYZ tristimulus values using given colour matching functions.

If the wavelength $\lambda$ is not available in the colour matching function, its value will be calculated using CIE recommendations: The method developed by Sprague (1880) should be used for interpolating functions having a uniformly spaced independent variable and a Cubic Spline method for non-uniformly spaced independent variable.

Parameters:	wavelength (numeric or array_like) – Wavelength $\lambda$ in nm. cmfs (XYZ_ColourMatchingFunctions, optional) – Standard observer colour matching functions. method (unicode, optional) – {None, ‘Cubic Spline’, ‘Linear’, ‘Pchip’, ‘Sprague’}, Enforce given interpolation method.
Returns:	CIE XYZ tristimulus values.
Return type:	ndarray
Raises:	`RuntimeError` – If Sprague (1880) interpolation method is forced with a non-uniformly spaced independent variable. `ValueError` – If the interpolation method is not defined or if wavelength $\lambda$ is not contained in the colour matching functions domain.

Notes

Output CIE XYZ tristimulus values are in range [0, 1].
If scipy is not unavailable the Cubic Spline method will fallback to legacy Linear interpolation.
Sprague (1880) interpolator cannot be used for interpolating functions having a non-uniformly spaced independent variable.

Warning

If scipy is not unavailable the Cubic Spline method will fallback to legacy Linear interpolation.
Cubic Spline interpolator requires at least 3 wavelengths $\lambda_n$ for interpolation.
Linear interpolator requires at least 2 wavelengths $\lambda_n$ for interpolation.
Pchip interpolator requires at least 2 wavelengths $\lambda_n$ for interpolation.
Sprague (1880) interpolator requires at least 6 wavelengths $\lambda_n$ for interpolation.

Examples

Uniform data is using Sprague (1880) interpolation by default:

>>> from colour import CMFS
>>> cmfs = CMFS['CIE 1931 2 Degree Standard Observer']
>>> wavelength_to_XYZ(480, cmfs)  
array([ 0.09564  ,  0.13902  ,  0.812950...])
>>> wavelength_to_XYZ(480.5, cmfs)  
array([ 0.0914287...,  0.1418350...,  0.7915726...])

Enforcing Cubic Spline interpolation:

>>> wavelength_to_XYZ(480.5, cmfs, 'Cubic Spline')  
array([ 0.0914288...,  0.1418351...,  0.7915729...])

Enforcing Linear interpolation:

>>> wavelength_to_XYZ(480.5, cmfs, 'Linear')  
array([ 0.0914697...,  0.1418482...,  0.7917337...])

Enforcing Pchip interpolation:

>>> wavelength_to_XYZ(480.5, cmfs, 'Pchip')  
array([ 0.0914280...,  0.1418341...,  0.7915711...])

colour.colorimetry.whiteness(method=u'CIE 2004', **kwargs)[source]¶

Returns the whiteness $W$ using given method.

Other Parameters:
Parameters:	method (unicode, optional) – {‘CIE 2004’, ‘Berger 1959’, ‘Taube 1960’, ‘Stensby 1968’, ‘ASTM 313’, ‘Ganz 1979’, ‘CIE 2004’}, Computation method.
	XYZ (array_like) – {`whiteness_Berger1959()`, `whiteness_Taube1960()`, `whiteness_ASTM313()`}, CIE XYZ tristimulus values of sample. XYZ_0 (array_like) – {`whiteness_Berger1959()`, `whiteness_Taube1960()`}, CIE XYZ tristimulus values of reference white. Lab (array_like) – {`whiteness_Stensby1968()`}, CIE Lab colourspace array of sample. xy (array_like) – {`whiteness_Ganz1979()`, `whiteness_CIE2004()`}, Chromaticity coordinates xy of sample. Y (numeric or array_like) – {`whiteness_Ganz1979()`, `whiteness_CIE2004()`}, Tristimulus $Y$ value of sample. xy_n (array_like) – {`whiteness_CIE2004()`}, Chromaticity coordinates xy_n of perfect diffuser. observer (unicode, optional) – {`whiteness_CIE2004()`}, {‘CIE 1931 2 Degree Standard Observer’, ‘CIE 1964 10 Degree Standard Observer’}, CIE Standard Observer used for computations, tint $T$ or $T_{10}$ value is dependent on viewing field angular subtense.
Returns:	whiteness $W$.
Return type:	numeric or ndarray

Examples

>>> xy = np.array([0.3167, 0.3334])
>>> Y = 100
>>> xy_n = np.array([0.3139, 0.3311])
>>> whiteness(xy=xy, Y=Y, xy_n=xy_n)  
array([ 93.85...,  -1.305...])
>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> XYZ_0 = np.array([94.80966767, 100.00000000, 107.30513595])
>>> method = 'Taube 1960'
>>> whiteness(XYZ=XYZ, XYZ_0=XYZ_0, method=method)  
91.4071738...

colour.colorimetry.whiteness_Berger1959(XYZ, XYZ_0)[source]¶

Returns the whiteness index $WI$ of given sample CIE XYZ tristimulus values using Berger (1959) method. [2]_

Parameters:	XYZ (array_like) – CIE XYZ tristimulus values of sample. XYZ_0 (array_like) – CIE XYZ tristimulus values of reference white.
Returns:	Whiteness $WI$.
Return type:	numeric or ndarray

Notes

Input CIE XYZ and CIE XYZ_0 tristimulus values are in domain [0, 100].
Whiteness $WI$ values larger than 33.33 indicate a bluish white and values smaller than 33.33 indicate a yellowish white.

Warning

The input domain of that definition is non standard!

Examples

>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> XYZ_0 = np.array([94.80966767, 100.00000000, 107.30513595])
>>> whiteness_Berger1959(XYZ, XYZ_0)  
30.3638017...

colour.colorimetry.whiteness_Taube1960(XYZ, XYZ_0)[source]¶

Returns the whiteness index $WI$ of given sample CIE XYZ tristimulus values using Taube (1960) method. [2]_

Parameters:	XYZ (array_like) – CIE XYZ tristimulus values of sample. XYZ_0 (array_like) – CIE XYZ tristimulus values of reference white.
Returns:	Whiteness $WI$.
Return type:	numeric or ndarray

Notes

Input CIE XYZ and CIE XYZ_0 tristimulus values are in domain [0, 100].
Whiteness $WI$ values larger than 100 indicate a bluish white and values smaller than 100 indicate a yellowish white.

Examples

>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> XYZ_0 = np.array([94.80966767, 100.00000000, 107.30513595])
>>> whiteness_Taube1960(XYZ, XYZ_0)  
91.4071738...

colour.colorimetry.whiteness_Stensby1968(Lab)[source]¶

Returns the whiteness index $WI$ of given sample CIE Lab colourspace array using Stensby (1968) method. [2]_

Parameters:	Lab (array_like) – CIE Lab colourspace array of sample.
Returns:	Whiteness $WI$.
Return type:	numeric or ndarray

Notes

Input CIE Lab colourspace array is in domain [0, 100].
Whiteness $WI$ values larger than 100 indicate a bluish white and values smaller than 100 indicate a yellowish white.

Examples

>>> Lab = np.array([100.00000000, -2.46875131, -16.72486654])
>>> whiteness_Stensby1968(Lab)  
142.7683456...

colour.colorimetry.whiteness_ASTM313(XYZ)[source]¶

Returns the whiteness index $WI$ of given sample CIE XYZ tristimulus values using ASTM 313 method. [2]_

Parameters:	XYZ (array_like) – CIE XYZ tristimulus values of sample.
Returns:	Whiteness $WI$.
Return type:	numeric or ndarray

Notes

Input CIE XYZ tristimulus values are in domain [0, 100].

Warning

The input domain of that definition is non standard!

Examples

>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> whiteness_ASTM313(XYZ)  
55.7400000...

colour.colorimetry.whiteness_Ganz1979(xy, Y)[source]¶

Returns the whiteness index $W$ and tint $T$ of given sample xy chromaticity coordinates using Ganz and Griesser (1979) method. [2]_

Parameters:	xy (array_like) – Chromaticity coordinates xy of sample. Y (numeric or array_like) – Tristimulus $Y$ value of sample.
Returns:	Whiteness $W$ and tint $T$.
Return type:	ndarray

Notes

Input tristimulus $Y$ value is in domain [0, 100].
The formula coefficients are valid for CIE Standard Illuminant D Series D65 and CIE 1964 10 Degree Standard Observer.
Positive output tint $T$ values indicate a greener tint while negative values indicate a redder tint.
Whiteness differences of less than 5 Ganz units appear to be indistinguishable to the human eye.
Tint differences of less than 0.5 Ganz units appear to be indistinguishable to the human eye.

Warning

The input domain of that definition is non standard!

Examples

>>> xy = np.array([0.3167, 0.3334])
>>> whiteness_Ganz1979(xy, 100)  
array([ 85.6003766...,   0.6789003...])

colour.colorimetry.whiteness_CIE2004(xy, Y, xy_n, observer=u'CIE 1931 2 Degree Standard Observer')[source]¶

Returns the whiteness $W$ or $W_{10}$ and tint $T$ or $T_{10}$ of given sample xy chromaticity coordinates using CIE 2004 method.

Parameters:	xy (array_like) – Chromaticity coordinates xy of sample. Y (numeric or array_like) – Tristimulus $Y$ value of sample. xy_n (array_like) – Chromaticity coordinates xy_n of perfect diffuser. observer (unicode, optional) – {‘CIE 1931 2 Degree Standard Observer’, ‘CIE 1964 10 Degree Standard Observer’}, CIE Standard Observer used for computations, tint $T$ or $T_{10}$ value is dependent on viewing field angular subtense.
Returns:	Whiteness $W$ or $W_{10}$ and tint $T$ or $T_{10}$ of given sample.
Return type:	ndarray

Notes

Input tristimulus $Y$ value is in domain [0, 100].
This method may be used only for samples whose values of $W$ or $W_{10}$ lie within the following limits: greater than 40 and less than 5Y - 280, or 5Y10 - 280.
This method may be used only for samples whose values of $T$ or $T_{10}$ lie within the following limits: greater than -4 and less than +2.
Output whiteness $W$ or $W_{10}$ values larger than 100 indicate a bluish white while values smaller than 100 indicate a yellowish white. [2]_
Positive output tint $T$ or $T_{10}$ values indicate a greener tint while negative values indicate a redder tint.

Warning

The input domain of that definition is non standard!

References

[4]	CIE TC 1-48. (2004). The evaluation of whiteness. In CIE 015:2004 Colorimetry, 3rd Edition (p. 24). ISBN:978-3-901-90633-6

Examples

>>> xy = np.array([0.3167, 0.3334])
>>> xy_n = np.array([0.3139, 0.3311])
>>> whiteness_CIE2004(xy, 100, xy_n)  
array([ 93.85...,  -1.305...])