I have a custom beamer template that frames the content of each slide, like the standard themes but with wiggly header/footer lines.
I add the background image of the template with
I now want the content to be behind the background image and the rest of the template (title, page number...). The template will then have a cut-out with the content visible underneath. The background image can have .png or .pdf transparency.
Kind of like: http://en.wikipedia.org/wiki/Passe-Partout_%28framing%29
Does anyone have an idea how to move the content behind the background image?
Thank you for your help!