光の三原色:RGB; 色の三原色:CMY(K)
red(#FF0000) + cyan(#00FFFF) = white(#FFFFFF)
green(#00FF00) + magenta(#FF00FF) = white(#FFFFFF)
blue(#0000FF) + yellow(#FFFF00) = white(#FFFFFF)
cyan(#00FFFF) = green(#00FF00) + blue(#0000FF)
magenta(#FF00FF) = red(#FF0000) + blue(#0000FF)
yellow(#FFFF00) = red(#FF0000) + green(#00FF00)
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