That is what is at the heart of my question: is there such a thing as TIFF Group 6 compression? I've never heard of TIFF Group 6, but a customer recently asked one of our salesmen whether our software supports TIFF Group 6. I'm asking whether anyone has ever heard of TIFF Group 6, what they know about it, and whether they can point me to more info on it. Also, what is Group 5?