<laugh type="mwahahah">Avoiding such comments is the exact motivation that prevented me to publish a more or less similar script for HTML table images (I've put one of those images in my homenode btw).</laugh>

Jokes apart, I was stopped by a comment in IRC channel #linux-it (in Italian, on Freenode) pointing out that GIMP does this "from ages". It would be interesting to understand if you did it before GIMP, so that I can reply "Yeah? well, merlyn does this from more ages!".