NedL: you are asking a philosophical question to a person not properly versed...
It would seem to me that, here, in this instance, the human brain (flawed as it is) nevertheless sets the 'standard' of perfection as far as proper hues go. But, on the other hand, it would also seem to me that acutance is not relative, but absolute, in measurement. (How could it NOT be, as it is essentially mathematical?) It would be interesting to see if I am agreed with or refuted but I plead ignorance here.
Here is the source of my original query: The Amateur Photographer's Handbook by Aaron Sussman, 8th revised edition, 1973. Page 526, Hints and Suggestions #46:
- David Lyga