As you can see, making small images print well takes some effort, but it can be done. [Lesa Snider, author of Photoshop CS5: The Missing Manual (Pogue Press/O’Reilly) ...

Like most other mobile photo printers, the Hi-Print shoots out credit card-sized 2.1-by-3.4-inch prints (54 by 86 mm). They have sticker backs so you can slap them on just about anything.