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Luma vs lightness

Luma vs lightness

Luma is calculated from (gamma-encoded) sRGB coordinates by the formula $\textrm{Luma} = 0.299 R + 0.587 G + 0.114 B.$

Linear luma

Luma of Lena

Lightness is the $L^*$ component of the $L^* a^* b^*$ color space. The coordinates of the form $(L^*, 0, 0)$ have been mapped to the sRGB color space for image storage.

Linear lightness

Lightness of Lena