colour.XYZ_to_xyY¶

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

Converts from CIE XYZ tristimulus values to CIE xyY colourspace and reference illuminant.

Parameters:	XYZ (array_like) – CIE XYZ tristimulus values. illuminant (array_like, optional) – Reference illuminant chromaticity coordinates.
Returns:	CIE xyY colourspace array.
Return type:	ndarray

Notes

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

Range	Scale - Reference	Scale - 1
`xyY`	[0, 1]	[0, 1]

References

[Lin03b], [Wik05a]

Examples

>>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952])
>>> XYZ_to_xyY(XYZ)  # doctest: +ELLIPSIS
array([ 0.5436955...,  0.3210794...,  0.1219722...])