colour.lightness¶

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

Returns the Lightness \(L\) of given luminance \(Y\) using given method.

Parameters

Y (numeric or array_like) – luminance \(Y\).
method (unicode, optional) – {‘CIE 1976’, ‘Glasser 1958’, ‘Wyszecki 1963’, ‘Fairchild 2010’, ‘Fairchild 2011’}, Computation method.
Y_n (numeric or array_like, optional) – {colour.colorimetry.lightness_CIE1976()}, White reference luminance \(Y_n\).
epsilon (numeric or array_like, optional) – {colour.colorimetry.lightness_Fairchild2010(), colour.colorimetry.lightness_Fairchild2011()}, \(\epsilon\) exponent.

Returns

Lightness \(L\).

Return type

numeric or array_like

Notes

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

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

References

[], [], [], [], [], [], []

Examples

>>> lightness(12.19722535)  
41.5278758...
>>> lightness(12.19722535, Y_n=100)  
41.5278758...
>>> lightness(12.19722535, Y_n=95)  
42.5199307...
>>> lightness(12.19722535, method='Glasser 1958')  
39.8351264...
>>> lightness(12.19722535, method='Wyszecki 1963')  
40.5475745...
>>> lightness(12.19722535, epsilon=0.710, method='Fairchild 2011')
... 
29.8295108...