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image = MiniMagick::Image.open('source.jpg')
image.colorspace 'gray'
pixels = image.get_pixels
0.upto(image.height - 1) do |y|
image.combine_options do |c|
0.upto(image.width - 1) do |x|
color = pixels[y][x][0]
c.draw "fill #{black_color} color #{x},#{y} point" if color < 250
end
end
end
image.write('destination.jpg')
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