def percentage_diff(org, fresh)
      diff_images(org, fresh)
      @total_px = @images.first.pixels.length
      @changed_px = @diff_index.length
      @percentage_changed = ( (@diff_index.length.to_f / @images.first.pixels.length) * 100 ).round(2)
    end
def percentage_diff(org, fresh)
      diff_images(org, fresh)
      @total_px = @images.first.pixels.length
      @changed_px = @diff_index.length
      @percentage_changed = ( (@diff_index.length.to_f / @images.first.pixels.length) * 100 ).round(2)
    end
Returns the numeric results of the diff of 2 images