Take into account foreground alpha for contrast #120
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Description
Calculates a contrast ratio for colors with an alpha channel by mixing the color in the
srgbspace. More info on whysrgbinstead of the color's space can be found in this comment.Steps to test/reproduce
Test contrast in different spaces with different alpha levels.
Show me
I added the premultiplied color below the foreground color, as it is in essence a 3rd color that is generated.
I've added 2 boxes that show the color as blended by your display and the result of the premultiplication mix in
srgb. We may want to show this info somewhere, but likely not where it is.