colour.colorimetry.lightness_Fairchild2010

colour.colorimetry.lightness_Fairchild2010(Y: Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1], epsilon: ArrayLike = 1.836) → Annotated[ndarray[tuple[Any, ...], dtype[float16 | float32 | float64]], 100]

Compute lightness \(L_{hdr}\) from the specified luminance \(Y\) using Fairchild and Wyble (2010) method according to Michaelis-Menten kinetics.

Parameters:

• Y (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1]) – Luminance \(Y\).

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

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

[FW10]

Examples

>>> lightness_Fairchild2010(12.19722535 / 100)
np.float64(31.9963902...)