Essential Photo Editing:
Remember to backup and always work on a copy
Digital photo editing should always be performed on a copy. Before you begin, load the images onto your computer and backup the originals.
Always work on a copy.
Never, never, never work on your origianl image.
Your images are one-of-a-kind until you make a backup. Make a habit of immediately creating copies of all your new pictures when you load them onto the computer. Then you'll be safe to experiment, knowing you originals are safe.