colour.XYZ_to_Hunter_Lab¶
-
colour.
XYZ_to_Hunter_Lab
(XYZ, XYZ_n=array([ 96.38, 100., 82.45]), K_ab=array([ 173.51, 58.48]))[source]¶ Converts from CIE XYZ tristimulus values to Hunter L,a,b colour scale.
Parameters: - XYZ (array_like) – CIE XYZ tristimulus values.
- XYZ_n (array_like, optional) – Reference illuminant tristimulus values.
- K_ab (array_like, optional) – Reference illuminant chromaticity coefficients, if
K_ab
is set to None it will be computed usingcolour.XYZ_to_K_ab_HunterLab1966()
.
Returns: Hunter L,a,b colour scale array.
Return type: ndarray
Notes
- Input CIE XYZ and reference illuminant tristimulus values are in domain [0, 100].
- Output Lightness \(L^*\) is in range [0, 100].
References
Examples
>>> XYZ = np.array([0.07049534, 0.10080000, 0.09558313]) * 100 >>> D50 = HUNTERLAB_ILLUMINANTS[ ... 'CIE 1931 2 Degree Standard Observer']['D50'] >>> XYZ_to_Hunter_Lab(XYZ, D50.XYZ_n, D50.K_ab) array([ 31.7490157..., -15.1146262..., -2.7866075...])