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PdfReader reader = new PdfReader("C:/PDF/Test.pdf");
PdfStamper stamp = new PdfStamper(reader, new FileStream("C:/PDF/Test.pdf", FileMode.Create));
int n = reader.NumberOfPages;
int i = 0;
PdfContentByte under;
iTextSharp.text.Image im = iTextSharp.text.Image.GetInstance("C:/Image/123.jpg");
im.SetAbsolutePosition(440, 730);
im.ScaleAbsolute(160, 60);
while (i < n)
{
i++;
under = stamp.GetOverContent(i);
under.AddImage(im);
}
stamp.Close();
reader.Close();