colour.sRGB_to_XYZ

colour.sRGB_to_XYZ(RGB, illuminant=array([0.3127, 0.329]), chromatic_adaptation_method='CAT02', apply_cctf_decoding=True, **kwargs)[source]

Converts from sRGB colourspace to CIE XYZ tristimulus values.

Parameters
  • RGB (array_like) – sRGB colourspace array.

  • illuminant (array_like, optional) – Source illuminant chromaticity coordinates.

  • chromatic_adaptation_method (unicode, optional) – {‘CAT02’, ‘XYZ Scaling’, ‘Von Kries’, ‘Bradford’, ‘Sharp’, ‘Fairchild’, ‘CMCCAT97’, ‘CMCCAT2000’, ‘CAT02_BRILL_CAT’, ‘Bianco’, ‘Bianco PC’}, Chromatic adaptation method.

  • apply_cctf_decoding (bool, optional) – Apply sRGB decoding colour component transfer function / electro-optical transfer function.

Other Parameters

**kwargs (dict, optional) – Keywords arguments for deprecation management.

Returns

CIE XYZ tristimulus values.

Return type

ndarray

Notes

Domain

Scale - Reference

Scale - 1

RGB

[0, 1]

[0, 1]

Range

Scale - Reference

Scale - 1

XYZ

[0, 1]

[0, 1]

Examples

>>> import numpy as np
>>> RGB = np.array([0.70573936, 0.19248266, 0.22354169])
>>> sRGB_to_XYZ(RGB)  
array([ 0.2065429...,  0.1219794...,  0.0513714...])