RGB与CMY相互转化
RGB —> CMY//RGB values from 0 to 255
//CMY results from 0 to 1
C = 1 - ( R / 255 )
M = 1 - ( G / 255 )
Y = 1 - ( B / 255 ) CMY —> RGB
//CMY values from 0 to 1
//RGB results from 0 to 255
R = ( 1 - C ) * 255
G = ( 1 - M ) * 255
B = ( 1 - Y ) * 255
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