colour.colorimetry.lightness_Fairchild2011

colour.colorimetry.lightness_Fairchild2011(Y: Domain1, epsilon: ArrayLike = 0.474, method: Literal['hdr-CIELAB', 'hdr-IPT'] | str = 'hdr-CIELAB') → Range100

Compute lightness \(L_{hdr}\) from the specified luminance \(Y\) using Fairchild and Chen (2011) method according to Michaelis-Menten kinetics.

Parameters:

• Y (Domain1) – Luminance \(Y\).

• epsilon (ArrayLike) – \(\epsilon\) exponent.

• method (Literal['hdr-CIELAB', 'hdr-IPT'] | str) – Lightness \(L_{hdr}\) computation method.

Returns:

Lightness \(L_{hdr}\).

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
Y	1	1

Range	Scale - Reference	Scale - 1
L_hdr	100	1

References

[FC11]

Examples

>>> lightness_Fairchild2011(12.19722535 / 100)
51.8529584...
>>> lightness_Fairchild2011(12.19722535 / 100, method="hdr-IPT")
...
51.6431084...