I can't say I've tried this, but the .NET version looks pretty straightforward.

http://www.mikesdotnetting.com/article/87/itextsharp-working-with-images

Yeah, I've seen a bunch of examples for adding images to the page content. The way that I have things set up is that I have an image form field on the PDF and I just want to populate that form field. So it's a little but different from the example you posted.

But thanks for trying :)