When it was initially installed, it took 16 hours to simply go through every photo in the library and identify a face - not yet assigning it a person. Then you select a photo (or multiple photos) and "tell" iPhoto who it is. Next, you make the computer search and try to find that person. Then, you confirm or reject. Through this process, you "teach" iPhoto who all the people are in your iPhoto library. I don't know how it does it, but it's amazing. The part that I find so crazy it that while my boys look alike, they must be different enough in their features that it know them. For example, I only "told" the computer who Zander was from some recent photos... yet it knows who Zander is from baby pictures! Crazy!


