I'd like to see operators in HSL space that force a minimal or maximal luminosity similar to the CAIRO_OPERATOR_DARKEN and CAIRO_OPERATOR_LIGHTEN: f(cA,cB) = set_lum(cB, max(lum(cA), lum(cA) ) f(cA,cB) = set_lum(cB, min(lum(cA), lum(cA) ) This can be used to provide a more accurate dark background to a rendering than what CAIRO_OPERATOR_DARKEN can provide.
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