colour.CIE1976UCS_to_XYZ#
- colour.CIE1976UCS_to_XYZ(uvL: 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:
uvL (ArrayLike) – \(uv^pL\*\) colourspace array.
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
uvL
u
: [-1, 1]v
: [-1, 1]L
: [0, 100]u
: [-1, 1]v
: [-1, 1]L
: [0, 1]illuminant
[0, 1]
[0, 1]
Range
Scale - Reference
Scale - 1
XYZ
[0, 1]
[0, 1]
Examples
>>> import numpy as np >>> uvL = np.array([0.37720213, 0.50120264, 41.52787529]) >>> CIE1976UCS_to_XYZ(uvL) array([ 0.2065400..., 0.1219722..., 0.0513695...])