When you create a duplicate layer and make your changes to the duplicate, can you save it and it apply to original picture or do you have to flatten it? This a very basic question but I normally make my changes to original picture and then save as a copy. Then when I close the original and it ask if I wish to save changes, I'll click no. Would this be the same as creating duplicate layer or will it still degrade the origianl over time? Thanks for help.
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