String selection = (String)getValue("selection");
// we create a reader for a certain document
PdfReader reader = new PdfReader(src.getAbsolutePath());
System.out.println("The original file had " + reader.getNumberOfPages() + " pages.");
reader.selectPages(selection);
int pages = reader.getNumberOfPages();
System.err.println("The new file has " + pages + " pages.");
LwgDocument document = new LwgDocument(reader.getPageSizeWithRotation(1));
PdfCopy copy = new PdfCopy(document, new FileOutputStream(dest.getAbsolutePath()));
document.open();