def save_visual_diff(org, fresh)
      x, y = @diff_index.map{ |xy| xy[0] }, @diff_index.map{ |xy| xy[1] }
      @diffed_image = org.insert(-5, '_diff')

      begin
        @images.last.rect(x.min, y.min, x.max, y.max, ChunkyPNG::Color.rgb(0,255,0))
      rescue NoMethodError
        puts "Both skins are the same.".color(:yellow)
      end
      
      @images.last.save(@diffed_image)
    end
def save_visual_diff(org, fresh)
      x, y = @diff_index.map{ |xy| xy[0] }, @diff_index.map{ |xy| xy[1] }
      @diffed_image = org.insert(-5, '_diff')

      begin
        @images.last.rect(x.min, y.min, x.max, y.max, ChunkyPNG::Color.rgb(0,255,0))
      rescue NoMethodError
        puts "Both skins are the same.".color(:yellow)
      end
      
      @images.last.save(@diffed_image)
    end
Saves the visual diff as a separate file