colour.XYZ_to_CIE1976UCS#
- colour.XYZ_to_CIE1976UCS(XYZ: ArrayLike, illuminant: ArrayLike = CCS_ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['D65']) NDArrayFloat [source]#
Convert from CIE XYZ tristimulus values to \(uv^pL\*\) colourspace.
This colourspace combines the \(uv^p\) chromaticity coordinates with the Lightness \(L\*\) from the CIE L*u*v* colourspace.
It is a convenient definition for use with the CIE 1976 UCS Chromaticity Diagram.
- Parameters:
XYZ (ArrayLike) – CIE XYZ tristimulus values.
illuminant (ArrayLike) – Reference illuminant CIE xy chromaticity coordinates or CIE xyY colourspace array.
- Returns:
\(uv^pL\*\) 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
uvL
u
: [-1, 1]v
: [-1, 1]L
: [0, 100]u
: [-1, 1]v
: [-1, 1]L
: [0, 1]Examples
>>> import numpy as np >>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952]) >>> XYZ_to_CIE1976UCS(XYZ) array([ 0.3772021..., 0.5012026..., 41.5278752...])