colour.colorimetry.intermediate_luminance_function_CIE1976

colour.colorimetry.intermediate_luminance_function_CIE1976(f_Y_Y_n, Y_n=100)[source]

Returns the luminance \(Y\) in the luminance \(Y\) computation for given intermediate value \(f(Y/Yn)\) using given reference white luminance \(Y_n\) as per CIE 1976 recommendation.

Parameters:
  • f_Y_Y_n (numeric or array_like) – Intermediate value \(f(Y/Yn)\).
  • Y_n (numeric or array_like) – White reference luminance \(Y_n\).
Returns:

luminance \(Y\).

Return type:

numeric or array_like

Notes

Domain Scale - Reference Scale - 1
f_Y_Y_n [0, 1] [0, 1]
Range Scale - Reference Scale - 1
Y [0, 100] [0, 100]

References

[CIETC1-482004m], [Wyszecki2000bd]

Examples

>>> intermediate_luminance_function_CIE1976(0.495929964178047)
... # doctest: +ELLIPSIS
12.1972253...
>>> intermediate_luminance_function_CIE1976(0.504482161449319, 95)
... # doctest: +ELLIPSIS
12.1972253...