colour.XYZ_to_xy

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

Returns the CIE xy chromaticity coordinates from given CIE XYZ tristimulus values.

Parameters:
  • XYZ (array_like) – CIE XYZ tristimulus values.
  • illuminant (array_like, optional) – Reference illuminant chromaticity coordinates.
Returns:

CIE xy chromaticity coordinates.

Return type:

ndarray

Notes

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

References

[Wikipedia2005]

Examples

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