Digital photography has made sharing photos easy — sometimes too easy. Work posted to the Web by lens-slingers can be misappropriated with abandon by the naive as well as the nefarious. One way shutterbugs try to protect their images is by watermarking them. A watermark is a logo, legend or other sign superimposed on a photo to identify its origin. Until recently, users of iPhoto, the photo management application included with every new Apple computer, had to resort to external programs to watermark their images.
