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<head>
<title>UK TeX FAQ -- question label unkgrfextn</title>
</head><body>
<h3>"Unknown graphics extension"</h3>
<p>The LaTeX graphics package deals with several different types of
DVI (or other) output drivers; each one of them has a potential
to deal with a different selection of graphics formats. The package
therefore has to be told what graphics file types its output driver
knows about; this is usually done in the <<i>driver</i>><code>.def</code> file
corresponding to the output driver you're using.
<p>The error message arises, then, if you have a graphics file whose
extension doesn't correspond with one your driver knows about. Most
often, this is because you're being optimistic: asking
<i>dvips</i> to deal with a <code>.png</code> file, or PDFTeX to deal with
a <code>.eps</code> file: the solution in this case is to transform the graphics
file to a format your driver knows about.
<p>If you happen to <em>know</em> that your device driver deals with the
format of your file, you are probably falling foul of a limitation of
the file name parsing code that the graphics package uses. Suppose
you want to include a graphics file <i>home.bedroom.eps</i> using the
<i>dvips</i> driver; the package will conclude that your file's
extension is <i>.bedroom.eps</i>, and will complain. To get around
this limitation, you have three alternatives:
<ul>
<li> Rename the file - for example <i>home.bedroom.eps</i>->
<i>home-bedroom.eps</i>
<li> Mask the first dot in the file name:
<pre>
\newcommand*{\DOT}{.}
\includegraphics{home\DOT bedroom.eps}
</pre>
<li> Tell the graphics package what the file is, by means of options
to the <code>\</code><code>includegraphics</code> command:
<pre>
\includegraphics[type=eps,ext=.eps,read=.eps]{home.bedroom}
</pre>
</ul>
<p><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=unkgrfextn">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=unkgrfextn</a>
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