example to be used in the book about LaTeX on en.wikibooks.org The picture of the Gull I have used is a commons featured picture Image:Gull portrait ca usa.jpg, I copied it locally and renamed it gull.jpg just to make it simpler. In the same directory, I created a file called caption.tex and I put the following code in it:

\documentclass[a4paper,12pt]{article}

\usepackage[english]{babel}
\usepackage{graphicx}

\begin{document}

\begin{figure}[!h]
  \caption{A picture of a gull.}
  \begin{center}
    \includegraphics[width=0.5\textwidth]{gull}
  \end{center}
\end{figure}

\begin{figure}[!h]
  \begin{center}
    \reflectbox{\includegraphics[width=0.5\textwidth]{gull}}
  \end{center}
  \caption{A picture of the same gull looking the other way!}
\end{figure}

\begin{table}[!h]
  \begin{center}
    \begin{tabular}{| l c r |}
    \hline
    1 & 2 & 3 \\
    4 & 5 & 6 \\
    7 & 8 & 9 \\
    \hline
    \end{tabular}
  \end{center}
  \caption{A simple table}
\end{table}

Notice how the tables and figures have independent counters.

\end{document}

Then I compiled it with pdflatex thus getting caption.pdf. Then I converted to PNG with the following Linux command:

convert caption.pdf caption.png