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I write some of my network notes in TeX. I wanted to make a table, and inside it insert an image:

see it here.

I wrote a document:

\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{booktabs}
\usepackage{array}

\begin{document}
\begin{tabular}{m{3cm}m{3cm}m{5cm}}
\toprule
Configuration for ... & Commands & Topology\\
\midrule
PPP: CHAP, PAP & \#sh int se 0/0/0  & \includegraphics[width=4cm, height=4cm]{chappap.png}\\
 & & \\
\bottomrule
\end{tabular}
\end{document}

But instead of my network topology image, I see only this: black picture.

I don't know what is wrong, cause my image is 100% in the same dir, as my *.tex file.

EDIT:

Changed my code as @Jubobs suggsted, no everything is just fine:

\documentclass{article}
    \usepackage{graphicx}
    \usepackage{booktabs}
    \usepackage{array}

    \begin{document}
    \begin{tabular}{m{3cm}m{3cm}m{5cm}}
    \toprule
    Configuration for ... & Commands & Topology\\
    \midrule
    PPP: CHAP, PAP & \#sh int se 0/0/0  & \includegraphics[width=4cm, height=4cm]{chappap.png}\\
     & & \\
    \bottomrule
    \end{tabular}
    \end{document}
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10  
That's what happens when the demo option is passed to the graphicx package: all external pictures are replaced by black rectangles. Do you also get the black rectangle without that option? – Jubobs May 4 '13 at 20:00
    
@Jubobs: Geez, didnt think about that it can be 'the problem' here. Thanks :D – Katie May 4 '13 at 20:03
up vote 10 down vote accepted

That's what happens when the demo option is passed to the graphicx package (as in your MWE). That option is described in the graphicx manual:

demo: Instead of inserting an image file \includegraphics draws a 150 pt by 100 pt rectangle unless other dimensions are specified manually.

If you want the actual external picture to be included by \includegraphics{...},

  1. disable the demo option,
  2. make sure that the path to that picture specified in \includegraphics{...} is correct.

Note that you will get an error from LaTeX, not merely a black rectangle, if the path to your external picture is incorrect.

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