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require 'chunky_png' | |
include ChunkyPNG::Color | |
images = [ | |
ChunkyPNG::Image.from_file('1.png'), | |
ChunkyPNG::Image.from_file('2.png') | |
] | |
output = ChunkyPNG::Image.new(images.first.width, images.last.width, WHITE) | |
diff = [] | |
images.first.height.times do |y| | |
images.first.row(y).each_with_index do |pixel, x| | |
unless pixel == images.last[x,y] | |
score = Math.sqrt( | |
(r(images.last[x,y]) - r(pixel)) ** 2 + | |
(g(images.last[x,y]) - g(pixel)) ** 2 + | |
(b(images.last[x,y]) - b(pixel)) ** 2 | |
) / Math.sqrt(MAX ** 2 * 3) | |
output[x,y] = grayscale(MAX - (score * 255).round) | |
diff << score | |
end | |
end | |
end | |
puts "pixels (total): #{images.first.pixels.length}" | |
puts "pixels changed: #{diff.length}" | |
puts "image changed (%): #{(diff.inject {|sum, value| sum + value} / images.first.pixels.length) * 100}%" | |
output.save('diff.png') |
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