We love keystrokes. They make everything go much faster, or at least they make it feel like we’re working faster. Here are a few keystrokes that we use all the time while in dialog boxes.
Option. Holding down the Option key while in a dialog box almost always changes the Cancel button into a Reset button, letting you reset the dialog box to its original state (the way it was when you first opened it). If you want to go keystrokes the whole way, type Command-Option-period to do the same thing.
Command-Z. You already know Command-Z (what Seattle’s Mac user group calls “Just Undo It”), because it’s gotten you out of more jams than you care to think about. Well, Command-Z performs an undo within dialog boxes, too. It undoes the last change you made. We use this all the time when we mistype.
Arrow keys. Many dialog boxes in Photoshop have text fields where you enter or change numbers. You can change those numbers by pressing the Up or Down arrow keys. Press once, and the number increases or decreases by one. If you hold down the Shift key while pressing the arrow key, it changes by 10. (Note that some dialog boxes change by a tenth or even a hundredth; when you hold down Shift, they change by 10 times as much.) A few dialog boxes use the arrow keys in a different way, or don’t use them at all. In the Lens Flare filter, for instance, the arrow keys move the position of the effect, and arrow keys just don’t do anything in most of the Distort filters.
Tab key. As in most Macintosh and Windows applications, the Tab key selects the next text field in dialog boxes with multiple text fields. You can use this in conjunction with the previous tip in dialog boxes such as the Unsharp Mask filter, or you can simply tab to the next field and type in a number if you already know the value you want.