colour.whiteness#

colour.whiteness(XYZ: Domain100, XYZ_0: ArrayLike, method: Literal['ASTM E313', 'CIE 2004', 'Berger 1959', 'Ganz 1979', 'Stensby 1968', 'Taube 1960'] | str = 'CIE 2004', **kwargs: Any) → Range100[source]#

Compute the whiteness index \(W\) of the specified sample CIE XYZ tristimulus values using the specified method.

Parameters:

XYZ (Domain100) – CIE XYZ tristimulus values of the sample.
XYZ_0 (ArrayLike) – CIE XYZ tristimulus values of the reference white.
method (Literal['ASTM E313', 'CIE 2004', 'Berger 1959', 'Ganz 1979', 'Stensby 1968', 'Taube 1960'] | str) – Computation method.
observer – {colour.colorimetry.whiteness_CIE2004()}, CIE Standard Observer used for computations, tint \(T\) or \(T_{10}\) value is dependent on viewing field angular subtense.
kwargs (Any)

Returns:

Whiteness index \(W\).

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
`XYZ`	100	1
`XYZ_0`	100	1

Range	Scale - Reference	Scale - 1
`W`	100	1

References

[CIET14804d], [WS00i], [XRitePantone12], [Wikipedia04c]

Examples

>>> import numpy as np
>>> from colour.models import xyY_to_XYZ
>>> XYZ = xyY_to_XYZ(np.array([0.3167, 0.3334, 100]))
>>> XYZ_0 = xyY_to_XYZ(np.array([0.3139, 0.3311, 100]))
>>> whiteness(XYZ, XYZ_0)
array([ 93.85...,  -1.305...])
>>> XYZ = np.array([95.00000000, 100.00000000, 105.00000000])
>>> XYZ_0 = np.array([94.80966767, 100.00000000, 107.30513595])
>>> whiteness(XYZ, XYZ_0, method="Taube 1960")
91.4071738...

colour.whiteness#

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