Holly,
In rereading your post I don't think I did exactly what you suggested. The images above are just severely cropped. I can zoom in as far as I want in my program and when I do they still look pretty similar.
This one is cropped about as much as I dare (expecting the ghost of Ansel Adams to appear).
I don't have any particular stake in proving this one way or the other, it's just something I got curious about.
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But try the same test with the highest jpg compression (lowest image quality), and the difference will be much more noticeable.
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It seems from what you say that if it is your intention to screw up the image you certainly can. Or, it may actually be screwed up but I am unable to see it. However, if you pay attention the information can be maintained sufficiently. Certainly to the extent that mine eyes are able to utilize it. This gets into the realm of "a wink is as good as a nod to a blind man."