StephenM
I know a Blithering Idiot
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Incorrect. It is impossible to crop into an image and not lose quality. Fact.
OK, I'll bite.
When I was 11 or 12, a teacher offered a prize to anyone who could draw a triangle with the sum of the interior angles not 180 degrees. There were no takers, but I could do it now, with greater knowledge. The way to make the impossible possible to is question the underlying assumption, in this case Euclidean geometry.
So, on the cropping question: I take a 10x8 contact print and crop it down to whole plate. The technical quality will be exactly the same. But that is the only way I can think of that it can be done. Until we have films and sensors that have infinite resolution and use lenses with infinite resolving power and no aberations.
The post above was made while I was typing. I can see what you're getting at, which is that if done sparingly, you can't see the difference. That then becomes subjective, and in some cases the result could be modified if you could make a side by side comparison with the same print (I always "think print") made from a larger original.