colour.colorimetry.luminance_Fairchild2011¶

colour.colorimetry.luminance_Fairchild2011(L_hdr, epsilon=0.474, method='hdr-CIELAB')[source]¶

Computes luminance \(Y\) of given Lightness \(L_{hdr}\) using Fairchild and Chen (2011) method according 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

Notes

Domain	Scale - Reference	Scale - 1
`L_hdr`	[0, 100]	[0, 1]

Range	Scale - Reference	Scale - 1
`Y`	[0, 1]	[0, 1]

References

[FC11]

Examples

>>> luminance_Fairchild2011(51.852958445912506)  # doctest: +ELLIPSIS
0.1219722...
>>> luminance_Fairchild2011(51.643108411718522, method='hdr-IPT')
... # doctest: +ELLIPSIS
0.1219722...