does anyone know a way to change the quality settings for the resizing of pictures? It's probably just one little change somewhere in the code, but I can't find it.
The actual settings do produce rather large files (more than 100 k for a 500x350 px image), which is just too much for small bandwidth users ...
Resizing is done with the GD library or ImageMagick. Check out function_images.inc.php. It's got all the code, but it uses generic versions that don't include quality. (So far as I know, only the imagejpeg supports a quality variable anyway.)