For Photoshop users, FYI, do not use the "Save As" (JPG) option, instead use the "Save for Web" option. This one does a much better job and has a 100 point quality scale instead of 10 point, letting you dial the file size very close to 15K. The results have less noise - must be a different algorithm. I used to produce really crappy thumbnails with the Save As, always having to go less than 150x150 to get good results and still under 15K.

Although I gotta say that, with the end-user able to choose how many thumbnails to show, would it not be reasonable to make the limit 20K instead of 15K? Even a dialup link should be able to handle that just fine.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)