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+<head>
+<title>UK TeX FAQ -- question label labelfig</title>
+</head><body>
+<h3>Labelling graphics</h3>
+<p>"Technical" graphics (such as graphs and diagrams) are often
+labelled with quite complex mathematical expressions: there are few
+drawing or graphing tools that can do such things (the honourable
+exception being MetaPost, which allows you to program the labels, in
+(La)TeX, in the middle of specifying your graphic).
+<p>Labels on graphics produced by all those <em>other</em> tools is where
+the <i>psfrag</i> package can help. Place an unique
+text in your graphic, using the normal text features of your tool, and
+you can ask <i>psfrag</i> to replace the text with arbitrary
+(La)TeX material. <i>Psfrag</i>'s "operative" command is
+<code>\</code><code>psfrag{<em>PS text</em>}{<em>Repl text</em>}</code>, which instructs
+the system to replace the original ("<code>PS</code>") text with the
+TeX-typeset replacement text. Optional
+arguments permit adjustment of position, scale and rotation; full
+details may be found in <i>pfgguide</i> in the distribution.
+(Unfortunately, <i>psfrag</i> can't be used with PDFLaTeX,
+though one might hope that it would be susceptible to the same sort of
+treatment as is used in the <i>pdftricks</i> package. On the other
+hand, <a href="FAQ-commercial.html">VTeX</a>'s GeX processor explicitly deals
+with <i>psfrag</i>, both in its free and commercial instances.)
+<p>Another useful approach is <i>overpic</i>, which overlays a
+<code>picture</code> environment on a graphic included by use of
+<code>\</code><code>includegraphics</code>. This treatment lends itself to ready placement
+of texts and the like on top of a graphic. The package can draw a
+grid for planning your "attack"; the distribution comes with simple
+examples.
+<p><i>Pstricks</i> can of course do everything that <i>overpic</i>
+can, with all the flexibility of PostScript programming that it offers.
+The <i>pstricks</i> web site has a page of
+<a href="http://pstricks.de/Examples/overlay.phtml">examples of labelling</a>
+which will get you started; if <i>pstricks</i> is
+<a href="FAQ-drawing.html">an option for you</a>, this route is worth a try.
+<p>The confident user may, of course, do the whole job in a picture
+environment which itself includes the graphic. I would recommend
+<i>overpic</i> or the <i>pstricks</i> approach, but such things
+are plainly little more than a convenience over what is achievable
+with the do-it-yourself approach.
+<dl>
+<dt><tt><i>overpic.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/overpic.zip">macros/latex/contrib/overpic</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/overpic.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/overpic/">browse</a>)
+<dt><tt><i>psfrag.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/psfrag.zip">macros/latex/contrib/psfrag</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/psfrag.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/psfrag/">browse</a>)
+<dt><tt><i>pstricks.sty</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/graphics/pstricks.zip">graphics/pstricks</a> (<a href="ftp://cam.ctan.org/tex-archive/graphics/pstricks.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/graphics/pstricks/">browse</a>)
+</dl>
+<p>
+<p><p><p><p><p><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=labelfig">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=labelfig</a>
+</body>