I have written an small iText program to watermark our internal pdf files. I
am using the PdfStamper and Image classes to add the watermark. The
resulting pdf displays an error pop-up in Adobe Reader (but not in Google
Chrome or PDF Exchange Viewer) and the added image is not visible. The code
snippet is below and I have attached a sample watermarked
http://itext-general.2136553.n4.nabble.com/file/n3498739/socrates.pdf
socrates.pdf pdf:
private File applyWatermarkToPdf(File newImageFile) throws Exception
{
Rectangle pdfRectangle = pdfReader.getPageSize(1);
File watermarkedPdfFile = new File(workDir, pdfFile.getName());
PdfStamper stamper = new PdfStamper(pdfReader, new
FileOutputStream(watermarkedPdfFile));
stamper.setRotateContents(false);
Image image = Image.getInstance(newImageFile.getAbsolutePath());
float maxPdfDimension = (pdfWidth > pdfHeight ? pdfWidth :
pdfHeight);
float minPdfDimension = (pdfWidth < pdfHeight ? pdfWidth :
pdfHeight);
float newImageWidth = 0.3f * maxPdfDimension;
float newImageHeight = imageFileHeight * (newImageWidth /
imageFileWidth);
image.scaleToFit(newImageWidth, newImageHeight);
image.setTransparency(new int[] {50,255});
image.setRotationDegrees(pageRotation);
if (pageRotation == 0.0f || pageRotation == 180.0f)
image.setAbsolutePosition(xOffsetWatermark, pdfHeight -
yOffsetWatermark);
else
image.setAbsolutePosition(xOffsetWatermark,
yOffsetWatermark);
PdfGState gstate = new PdfGState();
gstate.setFillOpacity(0.3f);
gstate.setStrokeOpacity(0.3f);
PdfContentByte pdfContent = stamper.getOverContent(1);
pdfContent.saveState();
pdfContent.setGState(gstate);
pdfContent.addImage(image);
stamper.close();
return watermarkedPdfFile;
}
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