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.
- Other Parameters
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
[CIET14804f], [FW10], [FC11], [GMRS58], [Wik07d], [Wys63], [WS00c]
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...