colour.XYZ_to_UVW#

colour.XYZ_to_UVW(XYZ: ArrayLike, illuminant: ArrayLike = CCS_ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['D65']) → NDArrayFloat[source]#

Convert from CIE XYZ tristimulus values to CIE 1964 U*V*W* colourspace.

Parameters:

XYZ (ArrayLike) – CIE XYZ tristimulus values.
illuminant (ArrayLike) – Reference illuminant CIE xy chromaticity coordinates or CIE xyY colourspace array.

Returns:

CIE 1964 U*V*W* colourspace array.

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
`XYZ`	[0, 100]	[0, 1]
`illuminant`	[0, 1]	[0, 1]

Range	Scale - Reference	Scale - 1
`UVW`	`U` : [-100, 100] `V` : [-100, 100] `W` : [0, 100]	`U` : [-1, 1] `V` : [-1, 1] `W` : [0, 1]

Range

Scale - Reference

Scale - 1

UVW

U : [-100, 100]

V : [-100, 100]

W : [0, 100]

U : [-1, 1]

V : [-1, 1]

W : [0, 1]

References

[Wikipedia08d]

Examples

>>> import numpy as np
>>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952]) * 100
>>> XYZ_to_UVW(XYZ)  
array([ 94.5503572...,  11.5553652...,  40.5475740...])