# File lib/dragonfly/generation/r_magick_generator.rb, line 45
      def plasma(width, height, format='png')
        image = Magick::Image.read("plasma:fractal"){self.size = "#{width}x#{height}"}.first
        image.format = format.to_s
        content = use_filesystem ? write_to_tempfile(image) : image.to_blob
        image.destroy!
        [
          content,
          {:format => format.to_sym, :name => "plasma.#{format}"}
        ]
      end