colour.colorimetry.lightness_CIE1976

colour.colorimetry.lightness_CIE1976(Y, Y_n=100)

Returns the Lightness \(L^*\) of given luminance \(Y\) using given reference white luminance \(Y_n\) as per CIE 1976 recommendation.

Parameters:

• Y (numeric or array_like) – luminance \(Y\).
• Y_n (numeric or array_like, optional) – White reference luminance \(Y_n\).

Returns:

Lightness \(L^*\).

Return type:

numeric or array_like

Notes

• Input luminance \(Y\) and \(Y_n\) are in domain [0, 100].
• Output Lightness \(L^*\) is in range [0, 100].

References

• [Lin03a]
• [WS00a]

Examples

>>> lightness_CIE1976(10.08)  
37.9856290...