[l2h] Relative URLs in png/gif images

[Bruce Miller]

Herb W. Swan wrote:
> LaTeX2HTML uses an absolute path name when including a gif or
> png image.  These absolute paths will break when the entire
> document is moved to a different location or a different server.
> Relative URLs would be more portable and appropriate if the user
> specifies an image path relative to the document.

I've lost track of which version is which (my RH9 installation includes
an odd, partly old version:
  This is jLaTeX2HTML Version 2002 (1.62) JA patch-1.4
but I would think the one you cite would include the modified
graphic(s|x) packages.

The _should_ generate a url to the image relative to the generated
page in cases like yours....
Unless perhaps the extra centering, or space, or probably the computed width=\foo
... or whatever is confusing latex2html enough that it's just punting to LaTeX
to process the entire environment.

Certainly in simpler cases, eg
 \includegraphics[width=anythingexplicit]{#2}
it should discover the .png, possibly do some simple image processing
(eg rotations), copy the image to destination, if needed, and
generate a relative url to it.
(omitting the image type is preferred so both LaTeX, pdflatex, latex2html, etc
can find the most appropriate type)

I apparently don't have a decent/recent version to test on, but that's
the way it was _supposed to work when I wrote it ....
(wasn't it actually _your_ original code that I adapted!)

> I am using the following version of LaTeX2HTML (l2h):
> 
> This is LaTeX2HTML Version 2002 (1.67)
> by Nikos Drakos, Computer Based Learning Unit, University of Leeds.
> 
> My test program is as follows:
> 
> -------------------------------------------------------------------------
> 
> \documentclass[11pt]{article}
> \usepackage{graphicx}
> \usepackage{html}
> \DeclareGraphicsExtensions{png}
> \DeclareGraphicsRule{.png}{eps}{.bb}{`pngtopnm #1|pnmtops -noturn -rle}
> \newlength{\gifwidth}
> 
> %
> %  The \showimage command displays a gif image in html,
> %  and a PostScript version of it in the ps document.  The optional
> %  argument 'width' overrides the natural width of the image.
> %
> %  Usage:  \showimage{image}{caption}
> %          \showimage[width]{image}{caption}
> %
> \newcommand{\showpng}[3][0.9\textwidth]{%
>     \setlength{\gifwidth}{#1}
>     \begin{figure}[htb]
> 	\begin{center}
> 	    \vspace{1ex}
> 	    \includegraphics[width=\gifwidth]{#2.png} \\
> 	    \caption{\label{#2}#3}
> 	    \end{center}
> 	\end{figure}
>     }
> 
> \begin{document}
> I'm going to include a png image right here:
> \showpng{l2h}{The figure caption}
> \end{document}
> 
>