Revert "Use PNG instead of JPG"
Revert "Use PNG instead of JPG"

This reverts commit e6ea45b2bd81f4abc4d89fd85ce219b25f48160d.

fzadow/CATMAID,htem/CATMAID,htem/CATMAID,fzadow/CATMAID,htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID