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I don't call it cheating... I call it simulation of the effects of cropping.

But seriously though, I was quite was surprised by how little is lost if you repeatedly encode the same image. Then again, it makes a lot of sense if you look at how blocks are encoded.

There was a nice article about that: http://www.hackerfactor.com/blog/index.php?/archives/355-How...

Turns out, not every JPEG encoder is identical in that regard and Photoshop destroys more than others.

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