Thank you, JayUtah, for taking the time to reply.

Let me make it clear that I do NOT for one second believe the image/s of Hale are anything other than what you say they are, "quantization and compression". I say that to reassure you that I am not fraudulently posing as a non-believer only to later reveal myself as a CT by refusing to accept the explanations (as I see that others do in other threads) thereby wasting your time

Unfortunately, logic will not convince my aquaintance and his growing band of believers, only evidence - and even then I'm doubtful .
If the effects are "very characteristic" then I presume there must be other examples of similar effects and, if not, why?

I'm sure any of you can "out-logic" me, but I would have thought that "whether they may have been duplicated elsewhere" DOES matter. If it is a repeated technical process wouldn't other examples occur? Wouldn't it be strange if none did?

PS @ DonnieB - the z axis exaggeration is 4, according to something I got from following a link (now lost) from the ESA site. "Vertical relief here is exaggerated by a factor of 4. The HRSC is a modified version of team leader Gerhard Neukum's original camera, which fell into the Pacific Ocean in November 1996 with Russia's Mars 96 probe." And I agree, very annoying that the exaggeration is not marked.