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

[Fairchild2011]

Examples

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