Adding a transition only for an image

Question

Suppose I have a slide defined as follows:

\begin{frame}[t,fragile]{Some Slide}
\begin{itemize}
\item An item
\item Another item
\end{itemize}

\pause

\begin{center}
\begin{tikzpicture}[overlay]

\transdissolve
\transduration{2}

\node[yshift=78] (img2)   {\includegraphics[scale=0.25]{someimage.png}};

\end{tikzpicture}
\end{center}    
\end{frame}

Now I want only the image to be show with a transition. In the above code, with the transition command added inside the tikzpicture environment, the complete slide as well as image are drawn with a transition. How do I restrict the transition to the image only?

Answer 1

Use it like this:

\documentclass{beamer}
\usepackage{tikz}
\begin{document}

\begin{frame}[t,fragile]{Some Slide}
\begin{itemize}
\item An item
\item Another item
\end{itemize}

\transdissolve<2>
\transduration{2}
\only<2>{
    \begin{center}
        \begin{tikzpicture}[overlay]
            \node[yshift=78] (img2) {\includegraphics[scale=0.25]{dummy.png}};
        \end{tikzpicture}
    \end{center}
}

\end{frame}

\end{document}

For more information visit section 14.3 of the excellent beamer manual.

(Be aware of the fact that transitions are in most cases really distracting. Always keep this in mind and rethink before using them.)