Digital photographs contain a limited amount of information in the form of small squares called pixels. Whether the images come from a digital camera or are scanned from film, once they're in the digital world they can't be enlarged. There is no way to increase their resolution (meaning size), which is measured in pixels per square inch. The recent photograph above of my daughters and I in San Francisco's Chinatown, was taken with an older iPhone and you don't have to zoom in much to see the pixels in my wolf daughter's face. And while a ...