I have a existing pdf file "layer_source.pdf", I want to add a background
picture "watermark.jpg" on each page of this file. I hope the background pic
is only visible on screen and won't be printed on paper. I use Pdflayer
class of itext v5.1.2 here. I use the mothed "setPrint("Print", false)", but
the pic is always printed on paper.
Below are my code. Could you guys give me some suggestion? Thanks a lot!
public static void addLayer() throws Exception{
PdfReader pdfReader = new PdfReader("D:\\layer_source.pdf");
PdfStamper stamper = new PdfStamper(pdfReader, new
FileOutputStream("D:\\layer_target.pdf"));
Image watermarkImage = Image.getInstance("D:/watermark.jpg");
PdfLayer wmLayer = new PdfLayer("watermark", stamper.getWriter());
wmLayer.setOnPanel(true);
// set layer parameters
wmLayer.setOn(false);
wmLayer.setView(true);
wmLayer.setPrint("Print", false);
// Prepare transperancy
PdfGState transparent = new PdfGState();
transparent.setStrokeOpacity(1f);
transparent.setFillOpacity(1f);
PdfContentByte cb;
int toPage = stamper.getReader().getNumberOfPages();
for (int i = 1; i <= toPage; i++) {
cb = stamper.getUnderContent(i);
Rectangle rectangle = stamper.getReader()
.getPageSizeWithRotation(i);
cb.beginLayer(wmLayer);
cb.setGState(transparent); // set block trasparency properties
//
position relative to top
watermarkImage.scaleAbsoluteHeight(rectangle.getHeight() - 20);
watermarkImage.scaleAbsoluteWidth(rectangle.getWidth() - 20);
float absoluteY = rectangle.getBottom() +
(rectangle.getHeight() -
watermarkImage.getPlainHeight() - 10);
watermarkImage.setAbsolutePosition(10, 10);
cb.addImage(watermarkImage);
cb.endLayer();
}
stamper.close();
}
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