Chunky

chunky3.png

pixelize.rb

require 'chunky_png'

module Pixelize

  # Replace chunks of an image with a single color.
  #
  # @param size Number of pixels to consolidate
  #
  def pixelize!(size)
    # Step over each chunk horizontally and vertically, being careful
    # not to exceed the boundaries (hence subtracting one).
    0.step(self.width-1, size) do |x1|
      x2 = x1+size-1
      0.step(self.height-1, size) do |y1|
        y2 = y1+size-1
        rect(x1, y1, x2, y2, ChunkyPNG::Color::TRANSPARENT, self[x1,y1])
      end
    end
  end

end


class ChunkyPNG::Image
  include Pixelize  
end


img = ChunkyPNG::Image.from_file('output.png')
img.pixelize!(10)
img.save('chunky3.png')