colour.colorimetry.luminance_Fairchild2011¶
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colour.colorimetry.
luminance_Fairchild2011
(L_hdr, epsilon=0.71, method=u'hdr-CIELAB')[source]¶ Computes luminance \(Y\) of given Lightness \(L_{hdr}\) using Fairchild and Chen (2011) method accordingly to Michealis-Menten kinetics.
Parameters: - L_hdr (array_like) – Lightness \(L_{hdr}\).
- epsilon (numeric or array_like, optional) – \(\epsilon\) exponent.
- method (unicode, optional) – {‘hdr-CIELAB’, ‘hdr-IPT’}, Lightness \(L_{hdr}\) computation method.
Returns: luminance \(Y\).
Return type: array_like
Warning
The output range of that definition is non standard!
Notes
- Output luminance \(Y\) is in range [0, math:infty].
References
Examples
>>> luminance_Fairchild2011(26.459509817572265) 0.1007999... >>> luminance_Fairchild2011(26.352467267703549, method='hdr-IPT') ... 0.1007999...