Edward C. <edw### [at] hotmailcom> wrote:
: Looking through the source for a formula to convert RGB values to grey
: values, I've discovered a number of slightly different formulas, none of
: which will convert RGB <1,1,1> to a grey value of 1.

  Are you sure? The weights for the color components are calculated with:

0.2125*R + 0.7154*G + 0.0721*B

  If we substitute R, G and B with 1's, we get exactly 1.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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