colour.colorimetry.lightness_Fairchild2010

colour.colorimetry.lightness_Fairchild2010(Y, epsilon=1.836)[source]

Computes Lightness \(L_{hdr}\) of given luminance \(Y\) using Fairchild and Wyble (2010) method according to Michealis-Menten kinetics.

Parameters:
  • Y (array_like) – luminance \(Y\).
  • epsilon (numeric or array_like, optional) – \(\epsilon\) exponent.
Returns:

Lightness \(L_{hdr}\).

Return type:

array_like

Warning

The input domain of that definition is non standard!

Notes

Domain Scale - Reference Scale - 1
Y [0, 1] [0, 1]
Range Scale - Reference Scale - 1
L_hdr [0, 100] [0, 1]

References

[Fairchild2010]

Examples

>>> lightness_Fairchild2010(12.19722535 / 100)  # doctest: +ELLIPSIS
31.9963902...