colour.XYZ_to_Luv

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

Converts from CIE XYZ tristimulus values to CIE L*u*v* colourspace.

Parameters
  • XYZ (array_like) – CIE XYZ tristimulus values.

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

Returns

CIE L*u*v* 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

Luv

L : [0, 100]

u : [-100, 100]

v : [-100, 100]

L : [0, 1]

u : [-1, 1]

v : [-1, 1]

References

[CIET14804f], [Wikipedia07c]

Examples

>>> import numpy as np
>>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952])
>>> XYZ_to_Luv(XYZ)  
array([ 41.5278752...,  96.8362605...,  17.7521014...])