# File lib/dragonfly/generation/image_magick_generator.rb, line 42
      def plasma(width, height, format='png')
        tempfile = new_tempfile(format)
        run "#{convert_command} -size #{width}x#{height} plasma:fractal #{tempfile.path}"
        [
          tempfile,
          {:format => format.to_sym, :name => "plasma.#{format}"}
        ]
      end