How to find complementary colour for pixel

[Laurent Pointal]

Steven D'Aprano a écrit :
> I shouldn't think so... I always forget if black is all ones or all
> zeroes, so I checked here: http://www.pitt.edu/~nisg/cis/web/cgi/rgb.html

For this I use the mnemotechnics idea of "chromatic coil" [*], when 
there are *all* colors turning it appear to be *white*. And *no* color 
is then *black*.



[*] Babelfish translation for french "roue chromatique"