# File lib/ansi_rgb.rb, line 9
      def initialize(ground, rgb)
        if RGB.outside_range?(rgb)
          raise ArgumentError.new("RGB value outside 0-255 range")
        end

        @ground_code = { :foreground => 38, :background => 48 }[ground]
        @red, @green, @blue = rgb[0], rgb[1], rgb[2]
      end