Image row in Beamer

Question

A presentation contains a huge amount of images. Therefor it would be nice if one can insert a row of images on the bottom of the slide. If the item apprears the corresponding image for instance is no longer grayscale.

Is there a package to make a row of images in a beamer presentation?

For instance I have a slide:

\begin{frame}
 \begin{enumerate}[<+->]
  \item Cat
  \item Dog
  \item Horse
 \end{enumerate}
\end{frame}

The bottom of the frame should contain three images (cat, dog, horse). When the cat item appears the cat image appears at the bottom, the same effect for the dog and horse.

Answer 1

You can use overlayarea and overlay specifications:

\documentclass{beamer}

\begin{document}

\begin{frame}
 \begin{enumerate}[<+->]
  \item Lion
  \item Cat
 \end{enumerate}

\vfill

\begin{overlayarea}{\textwidth}{2cm}
\only<1>{\centering\includegraphics[height=2cm]{ctanlion}\par}
\only<2>{\centering\includegraphics[height=2cm]{cat}\par}
\end{overlayarea}
\end{frame}

\end{document}

CTAN lion drawing by Duane Bibby.

Answer 2

I made a presentation using beamer, and at that time I use varblock environment, here one can write and include image in a certain location where ever you want.

By using varblock, I write 6 blocks and 3 of them was placed at the top and bottom blocks contains image. So the corresponding blocks contains the description of the image.

\begin{textblock}{}(1.1,2)
\begin{varblock}[5.5cm]{}
Any thing you can write OR
\includegraphics{your picture}
\end{varblock}
\end{textblock}

To declare varblock, you have to write the following command before \begin{document}.

\newenvironment<>{varblock}[2][\textwidth]{%
  \setlength{\textwidth}{#1}
  \begin{actionenv}#3%
    \def\insertblocktitle{#2}%
    \par%
    \usebeamertemplate{block begin}}
  {\par%
    \usebeamertemplate{block end}%
  \end{actionenv}}

Hope it will help you to solve your problem.