def diff_images(org, fresh)
      @images = [
        ChunkyPNG::Image.from_file(org),
        ChunkyPNG::Image.from_file(fresh)
      ]

      @diff_index = []
      begin
        diff_iterator
      rescue ChunkyPNG::OutOfBounds
        warn "Skins are different sizes. Please delete #{org} and/or #{fresh}.".color(:yellow)
      end
    end
def diff_images(org, fresh)
      @images = [
        ChunkyPNG::Image.from_file(org),
        ChunkyPNG::Image.from_file(fresh)
      ]

      @diff_index = []
      begin
        diff_iterator
      rescue ChunkyPNG::OutOfBounds
        warn "Skins are different sizes. Please delete #{org} and/or #{fresh}.".color(:yellow)
      end
    end
Pulled from Jeff Kreeftmeijer's post here: http://jeffkreeftmeijer.com/2011/comparing-images-and-creating-image-diffs/
 Thanks Jeff!