colour.colorimetry.lightness_CIE1976

colour.colorimetry.lightness_CIE1976(Y, Y_n=100)[source]

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

Domain

Scale - Reference

Scale - 1

Y

[0, 100]

[0, 1]

Range

Scale - Reference

Scale - 1

L_star

[0, 100]

[0, 1]

References

[CIET14804f], [WS00c]

Examples

>>> lightness_CIE1976(12.19722535)  
41.5278758...