Hi, I successfully create beamer presentations that contain individual slides that have full-screen (background) images, with the following latex code:
{\usebackgroundtemplate {\includegraphics[bb=0bp 0bp 1024bp 666bp,width=1\paperwidth]{image}} \begin{frame}[plain]~\end{frame} } However, when using a ratio-maintained image that incidentally does not have the same aspect as the slide size, I get a white strip for the uncovered part of the slide. Adding \setbeamercolor to the preamble or to specific frames leaves the frame that contains the \usebackgroundtemplate command unaffected. How can one control the colour of the *remaining* "background for a frame that uses the \usebackgroundtemplate command? Many thanks! Cheers, Sam