I suppose one option would be to build a script that opens the HTML in a web browser and then takes a screenshot of the web browser window. This is likely to be slow and non-portable, but I think it would work. If you could do it offline and cache the images it could probably be made to work.
A better solution might be to try to interface with an HTML rendering engine (like the Gecko engine used by Mozilla) and use it to generate a rendering in an image. This could be a very difficult task, but the results would likely be much better. If you go this route, consider building a Perl module that others can use to do the same task. A Perl interface to Gecko, for example, would be a popular module!
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.