colour.Lab_to_XYZ

colour.Lab_to_XYZ(Lab, illuminant=array([ 0.3127, 0.329 ]))[source]

Converts from CIE L*a*b* colourspace to CIE XYZ tristimulus values.

Parameters:
  • Lab (array_like) – CIE L*a*b* colourspace array.
  • illuminant (array_like, optional) – Reference illuminant CIE xy chromaticity coordinates or CIE xyY colourspace array.
Returns:

CIE XYZ tristimulus values.

Return type:

ndarray

Notes

Domain Scale - Reference Scale - 1
Lab

L : [0, 100]

a : [-100, 100]

b : [-100, 100]

L : [0, 1]

a : [-1, 1]

b : [-1, 1]

illuminant [0, 1] [0, 1]
Range Scale - Reference Scale - 1
XYZ [0, 1] [0, 1]

References

[CIETC1-482004m]

Examples

>>> Lab = np.array([41.52787529, 52.63858304, 26.92317922])
>>> Lab_to_XYZ(Lab)  # doctest: +ELLIPSIS
array([ 0.2065400...,  0.1219722...,  0.0513695...])