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

[Wikipedia05a]

Examples

>>> XYZ = np.array([0.20654008, 0.12197225, 0.05136952])
>>> XYZ_to_xy(XYZ)  
array([ 0.5436955...,  0.3210794...])