Twas brillig at 11:42:20 17.08.2009 UTC+10 when [email protected] did gyre and gimble:
CH(R> On Sun, 16 Aug 2009 20:25:10 +0700 Mikhail Gusarov <[email protected]> CH(R> said: >> This is needed for E-Ink devices outta there. Names of new files, >> configure.ac variables and macros are awful, suggestions are welcome. CHR> strange that u use a palette table lookup and you like to use rgb CHR> weighting on conversion to grayscale :) Well, I would ask X server for RGB values available in palette (is there approprite X request for this?), sort them and build Voronoi's diagram for optimal RGB->values mapping, but I felt it is kind of overkill :) Though it can be useful as a super-generic super-slow high-quality fallback. So I relied on the fact palette filler in EFL provides uniform filling, and hence the grayscale palette is a linear approximation of full-range 0..255 grayscale, so index in palette corresponds to the luminance picewise-linearily. </pretension to know math> -- http://fossarchy.blogspot.com/
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