> I can't modify a G4 compressed TIF file, apparently the G4 is not supported, is > that correct? that's correct. PIL cannot read or write any of the CCITT formats supported by TIFF. various people have promised me interfaces to libtiff, but a complete interface has still to appear (I have a partial implementation by someone somewhere, but no time to finish it -- at least not in time for 1.0). </F>