colour.Lab_to_XYZ

colour.Lab_to_XYZ(Lab, illuminant=array([ 0.3457, 0.3585]))[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 xy chromaticity coordinates or CIE xyY colourspace array.
Returns:

CIE XYZ tristimulus values.

Return type:

ndarray

Notes

  • Input Lightness \(L^*\) is in domain [0, 100].
  • Input illuminant xy chromaticity coordinates or CIE xyY colourspace array are in domain [0, \(\infty\)].
  • Output CIE XYZ tristimulus values are in range [0, 1].

References

Examples

>>> Lab = np.array([37.98562910, -23.62907688, -4.41746615])
>>> Lab_to_XYZ(Lab)  
array([ 0.0704953...,  0.1008    ,  0.0955831...])