colour.colorimetry.intermediate_lightness_function_CIE1976¶
- colour.colorimetry.intermediate_lightness_function_CIE1976(Y: FloatingOrArrayLike, Y_n: FloatingOrArrayLike = 100) FloatingOrNDArray[source]¶
Return the intermediate value \(f(Y/Yn)\) in the Lightness \(L^*\) computation for given luminance \(Y\) using given reference white luminance \(Y_n\) as per CIE 1976 recommendation.
- Parameters
Y (FloatingOrArrayLike) – Luminance \(Y\).
Y_n (FloatingOrArrayLike) – White reference luminance \(Y_n\).
- Returns
Intermediate value \(f(Y/Yn)\).
- Return type
Notes
Domain
Scale - Reference
Scale - 1
Y[0, 100]
[0, 100]
Range
Scale - Reference
Scale - 1
f_Y_Y_n[0, 1]
[0, 1]
References
[CIET14804f], [WS00c]
Examples
>>> intermediate_lightness_function_CIE1976(12.19722535) ... 0.4959299... >>> intermediate_lightness_function_CIE1976(12.19722535, 95) ... 0.5044821...