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The flagging mechanism described above is an adequate way to tag photos, but there are other ways, too. For example, the name you give a picture might be significant; its original file name on the hard drive might be important; and maybe you’ve typed some helpful clues into its Description field or given its Event a meaningful name.
Finding that kind of information is the purpose of the Search icon
() at the bottom left of the iPhoto toolbar. Start
by selecting the container you want to search—the Event, album, folder,
or whatever—and then proceed as shown in Figure 3-2.
iPhoto can search your photos’ metadata, too—the photographic details like camera manufacturer, f-stop, flash status, exposure settings, and so on. But you don’t use the Search box for that; you have to create a smart album instead, as described on Merging Albums.