I have not done it for a while and you have to have the same program to restore that the picture was cropped with, I.E. Photoshop. There was an instance a few years ago that a female newscaster supplied the station with a pic she had cropped with PS, some one uncropped it and posted her topless pic. Apparently all the data is still there the cropping just blocks it.
Before I made that post I checked to see where the technology was, apparently pics taken with iphones and cropped with iphones are susceptible. The one I uncropped was done with this old shareware editor that was popular about 10 years ago, I can't remember the name of it, I think it was ACDC, just opened it and did an Undo.
It's one of those anomolies that when you work in a shop with a bunch of techies, somebody digs up. One guy, with too much time on his hands, used to take discarded hard drives and run software that would undelete files, even if the drive had been formatted. He had a pretty nice collection of pics no one was supposed ot see.
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