Page Layout ⇒ Beamer with custom background: Vertical offset?

[StatSig]

So I've been happily using LaTeX for presentations for years, and usually just using the beamer default backgrounds. However, I unfortunately am forced for this particular presentation to use a custom background that is stored as a .pdf file. I've managed to get that much to work correctly, I can have the slideshow on that background using

Code: Select all

\usebackgroundtemplate{\includegraphics[width=\paperwidth,height=\paperheight]{template.pdf}}

However, this particular background has a large colored bar across the top, about .5in in height, that makes anything written on it unreadable. In this case, this means that the title for each slide is written there and so useless. I'd like to keep my slide titles, and am trying to find a way to shift the text--including title--down about .5in so that it does not overlap this annoying bar. This is where I'm running into the problem. Using \voffset=.5in or \geometry to set the top margin ALSO affects the margin for the template, meaning that I have the same problem as before, just shifted down .5 in with a blank bar above it.

For reference, here is the preamble I'm using:

Code: Select all

\documentclass{beamer}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{threeparttable}
\usepackage{geometry}
\usebackgroundtemplate{\includegraphics[width=\paperwidth,height=\paperheight]{FDAtemplate.pdf}}
%\geometry{top=.5in}

\title{....}
\begin{document}
etc.

Does anyone know how I can simply "bump down" the text in beamer including the title while keeping the background image stable? I've searched for a couple hours now to no avail. Thank you!