Hmm.... that's a good question. I don't think I've ever heard of it being done, personally.
Once the data is messed up that makes up the image... well, that's it. It's gone, I think.
Hopefully I'm wrong and there truly is a way to recover it, but I've never heard of any.
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"If you are not going to heaven, why miss it by an inch?" - Sam Kinison
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