A.
Before you do ANY editing on a photo, make a copy and do the editing on the copy. If you’re using Photoshop Elements 3.0, click on File—Duplicate to make a copy. Close the original. You can make copies of copies, so when you’ve accomplished something you want to keep, Save the file, make another Duplicate, and work on that one. Ctrl Z is the Undo keyboard shortcut in most editors and it will usually undo several steps back.
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