Printable Slide/Certificate of Completion

I'm seeking to create a printable slide at the very end of a course to act as a certificate of completion. I know that I can use a variable in the very beginning of the presentation where the user would type in their name, and have that variable (the person's name) display over a background image of the certificate as the last slide. The trick I'm trying to perform here is to get a quality, printed image of that last slide, without resorting to a low-res "print screen" option. Any advise is greatly appreciated. Thanks