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)  
0.1219722...
>>> luminance_Fairchild2011(51.643108411718522, method='hdr-IPT')
... 
0.1219722...