Ah, sounds like you've found the HTML to HTML2PS to GhostScript to JPEG method that I used before I discovered ImageMagick (which still needs HTML2PS to convert HTML files).
First I would download and then (if you really wanted to keep as much of the code in Perl as possible, download PerlMagick: but be warned, I know on Windows machines it can take quite a bit of tweaking to get working). Then install HTML2PS.
Once you've got ImageMagick+HTML2PS setup, I would call the convert function with the command convert myinputfile.html myoutputfile.jpg. The reason I used ImageMagick for the project I worked on was because I needed to make thumbnail images on the fly for a large number of different image types.