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26 lines
444 B
Ruby
26 lines
444 B
Ruby
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require 'chunky_png'
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include ChunkyPNG::Color
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# https://gist.github.com/jeffkreeftmeijer/923084
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module ChunkyPNG::Color
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def invert(value)
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rgb(MAX - r(value), MAX - g(value), MAX - b(value))
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end
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end
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source = ARGV.shift
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dest = ARGV.shift
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# joker-black.png
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img = ChunkyPNG::Image.from_file(source)
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img.pixels.map! do |p|
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if ChunkyPNG::Color.fully_transparent?(p)
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p
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else
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ChunkyPNG::Color.invert(p)
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end
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end
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img.save(dest)
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