colour.XYZ_to_Lab#
- colour.XYZ_to_Lab(XYZ: ArrayLike, illuminant: ArrayLike = CCS_ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['D65']) NDArrayFloat [source]#
Convert from CIE XYZ tristimulus values to CIE L*a*b* colourspace.
- Parameters:
XYZ (ArrayLike) – CIE XYZ tristimulus values.
illuminant (ArrayLike) – Reference illuminant CIE xy chromaticity coordinates or CIE xyY colourspace array.
- Returns:
CIE L*a*b* colourspace array.
- Return type:
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
Examples
>>> import numpy as np >>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952]) >>> XYZ_to_Lab(XYZ) array([ 41.5278752..., 52.6385830..., 26.9231792...])