RGB to CMYK

 

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Converts an RGB value to a CMYK property list

-- this function takes an rgb color value as its argument and returns a cmyk property list. -- cmyk values are expressed as percentages from 0 to 1 -- a yellow value of 0.5 signifies 50% yellow on cmyk rgbval   cyan = ( 255 - rgbval.red ) / 255.0   magenta = ( 255 - rgbval.green ) / 255.0   yellow = ( 255 - rgbval.blue ) / 255.0   black = min ( [ cyan, magenta, yellow ] )   cmykval = [ #cyan: cyan, #magenta: magenta, #yellow: yellow, #black: black]   return cmykval end