I got the Python Imaging Library from source, built and installed, on Ubuntu 7.10, not realizing I could run a self-test first. libjpeg is on the machine, but was not detected.. so no JPG encoder. I got the dev-libjpg and rebuilt PIL. The self-test now shows JPG support.
but running setup.py install again seems to succeed, but still no JPG :-( fix ideas appreciated -- http://mail.python.org/mailman/listinfo/python-list