Hello,
I need to add a watermark to a PDF that already has a background color. The
PDF document was created first, then a background color may be added, and a
watermark to be added after that.
I used the following code to add the background color:
PdfReader reader = new PdfReader(pdf);
int pages = reader.getNumberOfPages();
Rectangle pageSetup = reader.getPageSize(1);
pageSetup.setBackgroundColor(color);
document = new Document(pageSetup, 0, 0, 0, 0);
PdfWriter writer = PdfWriter.getInstance(document,
output);
document.open();
PdfImportedPage page;
for (int i = 1; i <= pages; i++) {
page = writer.getImportedPage(reader, i);
document.add(Image.getInstance(page));
}
Then in a later step, if a watermark is needed, we used the PdfStamper to
stamp in the UnderContent:
PdfStamper theStamper = new PdfStamper(thePdfReader,
theDocumentContent);
int iNumberPages = thePdfReader.getNumberOfPages();
int iPage = 0;
PdfContentByte thePdfContentByte;
while (iPage < iNumberPages) {
iPage++;
thePdfContentByte =
theStamper.getUnderContent(iPage);
thePdfContentByte.addImage(anImage);
}
The problem is that the watermark image is hidden behind the background
color (say Yellow).
Is it possible to find the "topmost" UnderContent, so that the watermark can
be added there in front of the background color?
Thank you for your help in advance.
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