    # File lib/RMagick.rb, line 814
        def color_reset!(fill)
            save = background_color
            # Change the background color _outside_ the begin block
            # so that if this object is frozen the exeception will be
            # raised before we have to handle it explicitly.
            self.background_color = fill
            begin
                erase!
            ensure
                self.background_color = save
            end
            self
        end