1999.12.01 19:20 "Re: libtiff 3.5.3 release.", by Chris Hanson
Most of the image I handle use CCITT compression, which I have presumed is lossless. It may be that the reason I get good small images is that for the most part I am operating on greyscale or binary images. Is CCITT not lossless, or is it that it is a 'non-standard' compression?
CCITT T.4 and T.6 (Group 3 and Group 4 Fax) compression is lossless, but it operates on bits rather than bytes. It's mainly intended for use with bilevel images.