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Old Oct 26, 2009, 6:37 PM   #11
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A little addendum.

If you have an image open and are editing it, and then you save the file, as has been explained a certain amount of date is lost. If the file is STILL open, and you decide to give it a new name and save it, no additional date is lost, since you have the image you are working on open in the image processor. In other words, in both case a small amount is lost, but one loses no more than the other. Only if you close the files and then open it again to save under a new name would additional date be lost.

And as T-Cav says, if you're saving with the least compression (In PS, that would be number 12) it's very difficult to see any data loss (In fact, I can't see any loss, although I know it's occuring).

Dave

Last edited by Chato; Oct 26, 2009 at 6:37 PM. Reason: typo
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Old Oct 26, 2009, 7:49 PM   #12
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Quote:
Originally Posted by Chato View Post
And as T-Cav says, if you're saving with the least compression (In PS, that would be number 12) it's very difficult to see any data loss (In fact, I can't see any loss, although I know it's occuring).
Another little addendum.

If an image had previously been saved with a moderate amount of compression, opening it later and saving it with less compression won't restore the lost detail. The compression is not lossless.
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Old Oct 27, 2009, 7:29 AM   #13
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Saving JPEG files is a pretty good subject that confuses a lot of people. I've found what I want to know about jpegs from this site... http://graphicssoft.about.com/od/for...mythsfacts.htm
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