colour.XYZ_to_Yrg#

colour.XYZ_to_Yrg(XYZ: ArrayLike) NDArrayFloat[source]#

Convert from CIE XYZ tristimulus values to Kirk (2019) Yrg colourspace.

Parameters:

XYZ (ArrayLike) – CIE XYZ tristimulus values values.

Returns:

Kirk (2019) Yrg \(Yrg\) luminance, redness, and greenness.

Return type:

numpy.ndarray

Notes

Domain

Scale - Reference

Scale - 1

XYZ

[0, 100]

[0, 1]

Range

Scale - Reference

Scale - 1

Yrg

Y : [0, 1]

r : [0, 1]

g : [0, 1]

Y : [0, 1]

r : [0, 1]

g : [0, 1]

References

[Kir19]

Examples

>>> import numpy as np
>>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952])
>>> XYZ_to_Yrg(XYZ)  
array([ 0.1313780...,  0.4903764...,  0.3777738...])