colour.Lab_to_XYZ#

colour.Lab_to_XYZ(Lab: ArrayLike, illuminant: ArrayLike = CCS_ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['D65']) numpy.ndarray[source]#

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

Parameters
  • Lab (ArrayLike) – CIE L*a*b* colourspace array.

  • illuminant (ArrayLike) – Reference illuminant CIE xy chromaticity coordinates or CIE xyY colourspace array.

Returns

CIE XYZ tristimulus values.

Return type

numpy.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

[CIET14804h]

Examples

>>> import numpy as np
>>> Lab = np.array([41.52787529, 52.63858304, 26.92317922])
>>> Lab_to_XYZ(Lab)  
array([ 0.2065400...,  0.1219722...,  0.0513695...])