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stephanschubert/RGB to CMYK with caching

Last active August 30, 2015 14:24
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Convert CMYK to RGB with automatic caching
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RGB to CMYK with caching
cmyk = Hash.new do |cache, rgb|
cmy = rgb.map { |color| 255 - color }
k = cmy.min
cache[rgb] = cmy.map { |color| color - k } + [k]
end
# Usage
cmyk[ [128, 42, 23] ] # => [0, 86, 105, 127]
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