colour.colorimetry.lightness_Fairchild2011¶
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colour.colorimetry.
lightness_Fairchild2011
(Y, epsilon=0.474, method='hdr-CIELAB')[source]¶ Computes Lightness \(L_{hdr}\) of given luminance \(Y\) using Fairchild and Chen (2011) method according to Michealis-Menten kinetics.
Parameters: - Y (array_like) – luminance \(Y\).
- epsilon (numeric or array_like, optional) – \(\epsilon\) exponent.
- method (unicode, optional) – {‘hdr-CIELAB’, ‘hdr-IPT’}, Lightness \(L_{hdr}\) computation method.
Returns: Lightness \(L_{hdr}\).
Return type: array_like
Notes
Domain Scale - Reference Scale - 1 Y
[0, 1] [0, 1] Range Scale - Reference Scale - 1 L_hdr
[0, 100] [0, 1] References
Examples
>>> lightness_Fairchild2011(12.19722535 / 100) # doctest: +ELLIPSIS 51.8529584... >>> lightness_Fairchild2011(12.19722535 / 100, method='hdr-IPT') ... # doctest: +ELLIPSIS 51.6431084...