[iText-questions] How to replace images in PDFs

[Paulo Soares]

Here's the code to replace images in PDFs, in Java and C#. It will replace 
the first image in the first page. You'll need the latest CVS.

PdfReader pdf = new PdfReader("in.pdf");
PdfStamper stp = new PdfStamper(pdf, new FileOutputStream("c:\\out.pdf"));
PdfWriter writer = stp.getWriter();
Image img = Image.getInstance("image.png");
PdfDictionary pg = pdf.getPageN(1);
PdfDictionary res = 
(PdfDictionary)PdfReader.getPdfObject(pg.get(PdfName.RESOURCES));
PdfDictionary xobj = 
(PdfDictionary)PdfReader.getPdfObject(res.get(PdfName.XOBJECT));
if (xobj != null) {
   for (Iterator it = xobj.getKeys().iterator(); it.hasNext();) {
       PdfObject obj = xobj.get((PdfName)it.next());
       if (obj.isIndirect()) {
           PdfDictionary tg = (PdfDictionary)PdfReader.getPdfObject(obj);
           PdfName type = 
(PdfName)PdfReader.getPdfObject(tg.get(PdfName.SUBTYPE));
           if (PdfName.IMAGE.equals(type)) {
               PdfReader.killIndirect(obj);
               Image maskImage = img.getImageMask();
               if (maskImage != null)
                   writer.addDirectImageSimple(maskImage);
               writer.addDirectImageSimple(img, (PRIndirectReference)obj);
               break;
           }
       }
   }
}
stp.close();
PdfReader pdf = new PdfReader("in.pdf");
PdfStamper stp = new PdfStamper(pdf, new FileStream("out.pdf", 
FileMode.Create));
PdfWriter writer = stp.Writer;
Image img = Image.GetInstance("image.png");
PdfDictionary pg = pdf.GetPageN(1);
PdfDictionary res = 
(PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));
PdfDictionary xobj = 
(PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));
if (xobj != null) {
   foreach (PdfName name in xobj.Keys) {
       PdfObject obj = xobj.Get(name);
       if (obj.IsIndirect()) {
           PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);
           PdfName type = 
(PdfName)PdfReader.GetPdfObject(tg.Get(PdfName.SUBTYPE));
           if (PdfName.IMAGE.Equals(type)) {
               PdfReader.KillIndirect(obj);
               Image maskImage = img.ImageMask;
               if (maskImage != null)
                   writer.AddDirectImageSimple(maskImage);
               writer.AddDirectImageSimple(img, (PRIndirectReference)obj);
               break;
           }
       }
   }
}
stp.Close();

Paulo 



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