* @param   yellow  the intensity of yellow. A value between 0 and 1
     * @param   black   the intensity of black. A value between 0 and 1
     */

    public void setCMYKColorFillF(final float cyan, final float magenta, final float yellow, final float black) {
        HelperCMYK(cyan, magenta, yellow, black);
        content.append(" k").append_i(separator);
    }