# File lib/dragonfly/processing/r_magick_processor.rb, line 113
      def vignette(temp_object, opts={})
        x      = opts[:x].to_f      || temp_object.width  * 0.1
        y      = opts[:y].to_f      || temp_object.height * 0.1
        radius = opts[:radius].to_f ||  0.0
        sigma  = opts[:sigma].to_f  || 10.0

        rmagick_image(temp_object) do |image|
          image.vignette(x, y, radius, sigma)
        end
      end