colour.luminance¶

colour.luminance(LV, method='CIE 1976', **kwargs)[source]¶

Returns the luminance \(Y\) of given Lightness \(L^*\) or given Munsell value \(V\).

Other Parameters:
Parameters:	LV (numeric or array_like) – Lightness \(L^\) or Munsell* value \(V\). method (unicode, optional) – {‘CIE 1976’, ‘Newhall 1943’, ‘ASTM D1535-08’, ‘Fairchild 2010’, ‘Fairchild 2011’}, Computation method.
	Y_n (numeric or array_like, optional) – {`colour.colorimetry.luminance_CIE1976()`}, White reference luminance \(Y_n\). epsilon (numeric or array_like, optional) – {`colour.colorimetry.lightness_Fairchild2010()`, `colour.colorimetry.lightness_Fairchild2011()`}, \(\epsilon\) exponent.
Returns:	luminance \(Y\).
Return type:	numeric or array_like

Notes

Domain	Scale - Reference	Scale - 1
`LV`	[0, 100]	[0, 1]

Range	Scale - Reference	Scale - 1
`Y`	[0, 100]	[0, 1]

References

[ASTMInternational08], [CIET14804f], [FW10], [FC11], [NNJ43], [Wik01c], [WS00c]

Examples

>>> luminance(41.527875844653451)  # doctest: +ELLIPSIS
12.1972253...
>>> luminance(41.527875844653451, Y_n=100)  # doctest: +ELLIPSIS
12.1972253...
>>> luminance(42.51993072812094, Y_n=95)  # doctest: +ELLIPSIS
12.1972253...
>>> luminance(4.08244375 * 10, method='Newhall 1943')
... # doctest: +ELLIPSIS
12.5500788...
>>> luminance(4.08244375 * 10, method='ASTM D1535-08')
... # doctest: +ELLIPSIS
12.2363426...
>>> luminance(29.829510892279330, epsilon=0.710, method='Fairchild 2011')
... # doctest: +ELLIPSIS
12.1972253...