    # File lib/rvg/rvg.rb, line 174
            def background_fill=(color)
                warn "background_fill= has no effect in nested RVG objects" if @nested
                if ! color.kind_of?(Magick::Pixel)
                    begin
                        @background_fill = Magick::Pixel.from_color(color)
                    rescue Magick::ImageMagickError
                        raise ArgumentError, "unknown color `#{color}'"
                    rescue TypeError
                        raise TypeError, "cannot convert #{color.class} into Pixel"
                    rescue
                        raise ArgumentError, "argument must be a color name or a Pixel (got #{color.class})"
                    end
                else
                    @background_fill = color
                end
            end