I was having a hard time converting a digital photo down to the correct 2"x2" physical size. Then I found this article: take your own passport photos. At first, I was thinking "Tell me something I don't know." Then I saw the link to the State department's own online passport photo editor (FIG_cropper). Perfect! Well, I'm still ugly in the photo, but they can only do so much.
Similar posts elsewhere on the Internet