Watermarking with PDFBox
题
I am trying to add a watermark to a PDF specifically with PDFBox. I've been able to get the image to appear on each page, but it loses the background transparency because it appears as though PDJpeg converts it to a JPG. Perhaps there's a way to do it using PDXObjectImage.
Here is what I have written thus far:
public static void watermarkPDF(PDDocument pdf) throws IOException
{
// Load watermark
BufferedImage buffered = ImageIO.read(new File("C:\\PDF_Test\\watermark.png"));
PDJpeg watermark = new PDJpeg(pdf, buffered);
// Loop through pages in PDF
List pages = pdf.getDocumentCatalog().getAllPages();
Iterator iter = pages.iterator();
while(iter.hasNext())
{
PDPage page = (PDPage)iter.next();
// Add watermark to individual page
PDPageContentStream stream = new PDPageContentStream(pdf, page, true, false);
stream.drawImage(watermark, 100, 0);
stream.close();
}
try
{
pdf.save("C:\\PDF_Test\\watermarktest.pdf");
}
catch (COSVisitorException e)
{
e.printStackTrace();
}
}
没有正确的解决方案
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