How to clear photos like in spy movies?

Question by Zezevel: How to clear photos like in spy movies?
It’s common in spy/police movies to clear and sharpen a photo,
in order to make it easier to spot the place where it was taken etc.
I found some tutorials explaining how to sharpen a photo in Photoshop,
but I am interested in specialized tutorials focusing in spy techniques.
I am more interesting in challenges, requiring the user to modify a photo in order to find some specific detail.
Any suggestions?
Thanks.

Best answer:

Answer by WaMSie
Often the things you see in movies are not technically possible. If a person’s face is contained in four pixels, you’re not going to be able to reconstruct the face from the one image.

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