colour.hdr_CIELab_to_XYZ#

colour.hdr_CIELab_to_XYZ(Lab_hdr: Domain100, illuminant: ArrayLike = CCS_ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['D65'], Y_s: Domain1 = 0.2, Y_abs: ArrayLike = 100, method: Literal['Fairchild 2011', 'Fairchild 2010'] | str = 'Fairchild 2011') → Range1[source]#

Convert from hdr-CIELAB colourspace to CIE XYZ tristimulus values.

Parameters:

Lab_hdr (Domain100) – hdr-CIELAB colourspace array.
illuminant (ArrayLike) – Reference illuminant CIE xy chromaticity coordinates or CIE xyY colourspace array.
Y_s (Domain1) – Relative luminance \(Y_s\) of the surround.
Y_abs (ArrayLike) – Absolute luminance \(Y_{abs}\) of the scene diffuse white in \(cd/m^2\).
method (Literal['Fairchild 2011', 'Fairchild 2010'] | str) – Computation method.

Returns:

CIE XYZ tristimulus values.

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
`Lab_hdr`	100	1
`illuminant`	1	1
`Y_s`	1	1

Range	Scale - Reference	Scale - 1
`XYZ`	1	1

References

[FW10], [FC11]

Examples

>>> Lab_hdr = np.array([51.87002062, 60.4763385, 32.14551912])
>>> hdr_CIELab_to_XYZ(Lab_hdr)
array([ 0.2065400...,  0.1219722...,  0.0513695...])
>>> Lab_hdr = np.array([31.99621114, 128.00763036, 48.76952309])
>>> hdr_CIELab_to_XYZ(Lab_hdr, method="Fairchild 2010")
...
array([ 0.2065400...,  0.1219722...,  0.0513695...])

colour.hdr_CIELab_to_XYZ#

This Page