colour.XYZ_to_xy

colour.XYZ_to_xy(XYZ, illuminant=array([ 0.3457, 0.3585]))[source]

Returns the 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:

xy chromaticity coordinates.
Return type:

ndarray

Notes

  • Input CIE XYZ tristimulus values are in domain [0, 1].
  • Output xy chromaticity coordinates are in range [0, 1].

References

Examples

>>> XYZ = np.array([0.07049534, 0.10080000, 0.09558313])
>>> XYZ_to_xy(XYZ)  
array([ 0.2641477...,  0.3777000...])