colour.colorimetry.lightness_Fairchild2011#
- colour.colorimetry.lightness_Fairchild2011(Y: ArrayLike, epsilon: ArrayLike = 0.474, method: Literal['hdr-CIELAB', 'hdr-IPT'] | str = 'hdr-CIELAB') NDArrayFloat [source]#
Compute Lightness \(L_{hdr}\) of given luminance \(Y\) using Fairchild and Chen (2011) method according to Michaelis-Menten kinetics.
- Parameters:
Y (ArrayLike) – Luminance \(Y\).
epsilon (ArrayLike) – \(\epsilon\) exponent.
method (Literal['hdr-CIELAB', 'hdr-IPT'] | str) – Lightness \(L_{hdr}\) computation method.
- Returns:
Lightness \(L_{hdr}\).
- Return type:
Notes
Domain
Scale - Reference
Scale - 1
Y
[0, 1]
[0, 1]
Range
Scale - Reference
Scale - 1
L_hdr
[0, 100]
[0, 1]
References
[FC11]
Examples
>>> lightness_Fairchild2011(12.19722535 / 100) 51.8529584... >>> lightness_Fairchild2011(12.19722535 / 100, method="hdr-IPT") ... 51.6431084...