colour.colorimetry.lightness_Fairchild2010

colour.colorimetry.lightness_Fairchild2010(Y, epsilon=1.836)

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

• Input luminance \(Y\) is in domain [0, \(\infty\)].

References

• [FW10]

Examples

>>> lightness_Fairchild2010(10.08 / 100)  
24.9022902...