# File lib/sass/script/functions.rb, line 1015
    def invert(color)
      return Sass::Script::String.new("invert(#{color})") if color.is_a?(Sass::Script::Number)

      assert_type color, :Color
      color.with(
        :red => (255 - color.red),
        :green => (255 - color.green),
        :blue => (255 - color.blue))
    end