How to include a background image to only one page, any page, of a beamer presentation?
With reference to Beamer: Transparent AND centered background image on intro slide
How can I include the background to only one page of the beamer presentation?
How to include a background image to only one page, any page, of a beamer presentation?
With reference to Beamer: Transparent AND centered background image on intro slide
How can I include the background to only one page of the beamer presentation?
You can declare the background just before the slide, and un-declare it just after it.:
\documentclass{beamer}
\usepackage{tikz}
\begin{document}
\begin{frame}
Background transparent image, not here
\end{frame}
\usebackgroundtemplate{% declare it
\tikz[overlay,remember picture] \node[opacity=0.3, at=(current page.center)] {
\includegraphics[height=\paperheight,width=\paperwidth]{example-image-a}};
}
\begin{frame}
Background transparent image, centered on slide
\end{frame}
\usebackgroundtemplate{ } %% undeclare it
\begin{frame}
Background transparent image, not here
\end{frame}
\end{document}

You can also use a group on the other hand:
\bgroup
\usebackgroundtemplate{%
\tikz[overlay,remember picture] \node[opacity=0.3, at=(current page.center)] {
\includegraphics[height=\paperheight,width=\paperwidth]{example-image-a}};
}
\begin{frame}
Background transparent image, centered on slide
\end{frame}
\egroup