Thanks! I think this will get me started.
(I don't use any Adobe products anymore either except an old pre-subscription version of Acrobat 10 "Pro", and I only have the copy on my windows 7 OS left of that one!
I found this tool, which is fortunately independent of Adobe products:
https://fineartprinting.com.sg/image-analyser/Seems to work ok for my purposes.