How can I export the stamp annotation from image to an image file?
问题 How can I export the “stamp annotation from image” to an image file? I have a pdf which contains stamp annotions (in fact it's an image), I want to export all these kinds of images to file and get the x/y position. I am new to pdf. Any idea or code will be appreciated. [--- Edited on 2019/08/08 ---] private void btnExtractAnnotaion_Click(object sender, EventArgs e) { PdfReader reader = new PdfReader(this.txtPdf.Text); PdfDictionary pageDict = reader.GetPageN(reader.NumberOfPages); PdfArray