<snip>
While the patch seems fine, this comment is not correct. The patch is
decreasing the *brightness* in order to *increase* saturation.
Saturation[1] is the deepness of a color, not the white component
(brightness, lightness).
- Jim Bruce
[1] http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC6
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