topnush
I have an image which should take the full screen in beamer.


\documentclass{beamer}
\usepackage{overpic}
\begin{document}
{
\begin{frame}[plain]
\makebox[\linewidth]{\includegraphics[height=\paperheight]{example-image-a}}
\end{frame}
}

\end{document}


I would like to write some text (the source of the image)  at the bottom in the middle in gray.  I tried overpic but I can't see how to  make it work in this case.
samcarter
One possible approach using Ti*k*Z:


\documentclass{beamer}

\usepackage{tikz}

\begin{document}

\begin{frame}[plain]
\begin{tikzpicture}[remember picture,overlay]

% Background image
\node[at=(current page.center)]{%
\includegraphics[height=\paperheight]{example-image-duck}
};

% Text
\node[at=(current page.south),yshift=0.2cm]{
\color{gray}Some text
};

\end{tikzpicture}
\end{frame}

\end{document}


![document.png](/image?hash=509f2cd52aa58057ddc73107e6da51632bcc39d846db6332f71d8eef982c40e7)

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