colour.XYZ_to_Lab

colour.XYZ_to_Lab(XYZ, illuminant=array([ 0.3127, 0.329 ]))

Converts from CIE XYZ tristimulus values to CIE L*a*b* colourspace.

Parameters:

• XYZ (array_like) – CIE XYZ tristimulus values.
• illuminant (array_like, optional) – Reference illuminant xy chromaticity coordinates or CIE xyY colourspace array.

Returns:

CIE L*a*b* colourspace array.

Return type:

ndarray

Notes

Domain	Scale - Reference	Scale - 1
XYZ	[0, 1]	[0, 1]
illuminant	[0, 1]	[0, 1]

Range	Scale - Reference	Scale - 1
Lab	L : [0, 100] a : [-100, 100] b : [-100, 100]	L : [0, 1] a : [-1, 1] b : [-1, 1]

References

[CIET14804f]

Examples

>>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952])
>>> XYZ_to_Lab(XYZ)  # doctest: +ELLIPSIS
array([ 41.5278752...,  52.6385830...,  26.9231792...])