batch tiff to jpeg conversion script

[rtilley at vt.edu]

Hi Peter. The guy who takes the pictures uses Photoshop to convert
tiffs to jpegs one by one. When he does a 'Maxium Quality' conversion
in Photoshop and I do a 100% quality conversion with Python and PIL,
the two converted files are almost identical and this is what he
wants... that's the only reason I'm using 100% quality. Thanks for the
info!