* @param page the page where the transition will be applied. The first page is 1
     */
    void setTransition(PdfTransition transition, int page) {
        PdfDictionary pg = reader.getPageN(page);
        if (transition == null)
            pg.remove(PdfName.TRANS);
        else
            pg.put(PdfName.TRANS, transition.getTransitionDictionary());
        markUsed(pg);
    }