rubberStamp.setRectangle(new PDRectangle(100,100));
rubberStamp.setContents("A top secret note");
// Create a PDXObjectImage with the given jpg
FileInputStream fin = new FileInputStream( args[2] );
PDJpeg mypic = new PDJpeg(document,fin);
//Define and set the target rectangle
PDRectangle myrect = new PDRectangle();
myrect.setUpperRightX(275);
myrect.setUpperRightY(575);