I always save everything as a tiff file because it loses NO quality whatsoever upon resaving and resaving and it is universal for PC and Mac. Once I am ready for posting I then save it as a jpeg so the file will not be so big, but I still keep the original tiff file for myself in case I wish to use it again at a future time. Unfortunatly this takes up almost as much room as Poser files, they're huge!! Every once in a while I have to unload my files onto CD's to get back my hard drive space. If you want to retain your quality image, tiff all the way, it's a standard. ~3D ;-)