OS X :: Loosing File Quality When Resaved It?

Dec 17, 2008

I wasn't sure where to post this, so I hope this is an okay location.

I recently read that if you open up a jpeg file and then resave it, it loses quality. Is this true?

Is it only Jpegs, or all compressed images? Or even yet, all images i.e. Raw?
What other scenario must I be aware of where file quality can be lost? Any with music files, or video files?

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