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Photoshop’s Preferences file stores a whole lot of information about how you use the program. Regardless of whether you prefer to measure in inches or pixels, how you like the grid and guides displayed, what size thumbnails you prefer in your panels, which font you used last — all sorts of data is maintained in the Prefs. Much of the info in the Preferences is picked up automatically as you work (such as the size and color mode of the last new document you created, whether the Character panel was visible when you last shut down the program, and which tool options were selected in the Options bar), but you must actively select a number of options in the Preferences dialog box, as shown in Figure 3-9.

FIGURE 3-9: Use Photoshop’s Preferences to establish many program behaviors.

Many of Photoshop’s handy reminder messages include a Don’t Show Again option. If you someday decide that you do indeed need to start seeing one or more of those reminders again, open the Preferences and click the Reset All Warning Dialogs button at the bottom of the General pane.

Your custom styles, brushes, Actions, and the like are recorded only in Photoshop’s Preferences until you actually save them to your hard drive. That makes them vulnerable to accidental loss. Use the menus of the various panels and pickers to export custom items. And make sure to export them in a safe location outside the Photoshop folder — you wouldn’t want to accidentally delete your custom bits and pieces if you should ever have to (oh, no!) reinstall Photoshop, would you?

Open the Preferences on a Mac with the keyboard shortcut ⌘ +K or choose Photoshop ⇒ Preferences to select one of the 17 specific subsets of Preferences to change. The shortcut for Windows users is Ctrl+K, and the Preferences submenu is under the Edit menu. The default settings are perfectly acceptable (after all, they are the defaults for a reason), but the following sections cover some changes to the Preferences to consider, listed by the section of the Preferences dialog box in which you find them.

Some of the changes you make in Photoshop’s Preferences are applied as soon as you click OK. Other changes don’t take effect until you restart the program. (You’ll get a reminder about that.)