QUESTION
I would like to make a slide of only one image without any borders or any other beamer specific element.
I tried :
\begin{frame}[plain]
\includegraphics[keepaspectratio=true,width=1\paperwidth]{kernel-panic.png}
\end{frame}
But I still get a border on the left, top and bottom.
Later edit: width=1.2\paperwidth seems to remove top and bottom borders. I still have a left border and some navigation elements on bottom right.
ANSWER
This works:
\documentclass{beamer}
\title{test of full size graphic}
\usepackage{tikz}
\usetheme{AnnArbor}
\begin{document}
\begin{frame}
\maketitle
Notice the fancy presentation theme.
\end{frame}
{ % all template changes are local to this group.
\setbeamertemplate{navigation symbols}{}
\begin{frame}[plain]
\begin{tikzpicture}[remember picture,overlay]
\node[at=(current page.center)] {
\includegraphics[width=\paperwidth]{yourimage}
};
\end{tikzpicture}
\end{frame}
}
\begin{frame}
symbols should be back now
\end{frame}
\end{document}
You have to run beamer twice to get the image centered in the right place. But if you have any other aux-file tricks (e.g., table of contents) you need to do that anyway.
If you're not already using tikz, you can save your image as a pdf and then use \includepdf (part of the pdfpages package). This will get you into trouble if you want to print your slides as an article or handout, though.