iPhoto 4 offers a great new way to categorize your pictures—by how great they are. You can assign each picture a rating of 1 to 5 stars, then use the ratings to sort your Photo Library, or gather only the cream of the crop into a slideshow (Chapter 9), smart album (page 126), or photo book (Chapter 10).
Here are the ways you can rate your digital masterpieces:
In Edit or Organize mode, select a photo (or several) and choose Photo → My Rating; from the submenu, choose one through five stars.
If the top of the screen is just too far away, you can also Control-click any one of the selected thumbnails (or, in Edit mode, anywhere on the photo) and choose the My Rating command from the shortcut menu. Its submenu is exactly the same as what you’d find in the Photo → My Rating command.
In Edit or Organize mode, select a photo (or several) and press
-1 for one star,
-2 for two stars, and so on. Press
-0 to strip away any existing ratings.
During a slideshow, twitch the mouse to bring up the onscreen control bar. In the bar, click the row of dots to turn them into rating stars (click the third dot to give the current photo three stars, for example). Or just press the number keys ...