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

[Lindbloom2003e], [Wikipedia2005]

Examples

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