# File lib/dragonfly/image_magick/generator.rb, line 42
      def plain(width, height, colour, opts={})
        opts = Dragonfly::Utils.symbolize_keys(opts)

        format = opts[:format] || 'png'
        [
          convert(nil, "-size #{width}x#{height} xc:#{colour}", format),
          {:format => format.to_sym, :name => "plain.#{format}"}
        ]
      end