# Image on full slide

I am trying to achieve a result similar to the one described here: Image on full slide in beamer package

but with a variant. Specifically I would like to put the figure in the whole slide but below the navigation bar. Any idea of how to do it?

Do you know how much space occupies the navigation bar? If your answer is yes, you can use something like:

\documentclass{beamer}

\setbeamertemplate{background}{
\parbox[c][\paperheight][c]{\paperwidth}{%
\vspace*{.1\paperheight}%
\includegraphics[height=.9\paperheight,width=\paperwidth]{example-image-a}}
}

\begin{document}

\begin{frame}

\end{frame}

\end{document}