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You must use the Save or Save As command to preserve changes to your images. After you save and close an image, some of those changes may be irreversible. When working with an important image, consider these tips:

 Work on a copy of the image file. Unless you’re working with a digital photo in the Raw format (discussed in Chapter 6), make a copy of your image file as a backup before changing it in Photoshop. The backup ensures that should something go horribly wrong, you can start over. (You never actually change a Raw photo — Photoshop can’t rewrite the original file — so you’re always, in effect, working on a copy.)

 Activate auto recovery. In Photoshop’s Preferences ⇒ File Handling panel, make sure that the Automatically Save Recovery Information Every option is selected and set to an appropriate time interval. If Photoshop crashes while you’re working, when you reopen the program, it will (hopefully) be able to present you with your artwork at the stage when last saved for auto recovery.

 Save your work as PSD file, too. Especially if your image has layers, save it in Photoshop’s PSD file format (complete with all the layers) before using Save As to create a final copy in another format. If you don’t save a copy with layers, going back to make one little change can cost hours of work.

Rather than choosing File ⇒ Open, consider making it a habit to choose File ⇒ Open As Smart Object. When working with Smart Objects, you can scale or transform multiple times without continually degrading the image quality, and you can work with Smart Filters, too! (You can read about Smart Filters in Chapter 14.)

If you attempt to close an image or quit Photoshop without saving your work first, you get a gentle reminder asking whether you want to save, close without saving, or cancel the close/quit (as shown in Figure 1-4).

FIGURE 1-4: Photoshop reminds you if you haven’t saved changes to an image.