An image, also called a “graphic”, in which the information content is in digital form. A photograph or other analog image can be “digitized” by a process which transforms the picture, a tiny segment at a time, into digital information. The tinier the segments, referred to as dots per inch (dpi), the finer the resolution (quality) of the resulting digital image. Probably the most common method now used for digitizing analog images is by use of a “scanner”, a device much like a photocopier or fax machine, except that the scanner sends the information it scans from the image directly to a computer, not onto paper or to the phone line. This scanned information is then stored in a file which can be manipulated by computer. Note that the higher the resolution of the digital image, the bigger the resulting file. Image files containing digital images frequently have file names ending with PCX, TIF, BMP, WMF, GIF, JPG, or others. Once an image is in digital form, it can readily be converted from one specific kind of file format to another, or manipulated in other ways. For example, a portion of the digital image might be recorded as the color red and the intensity as dim. This digital information could be easily replaced by a computer with the digital codes for green, and bright, respectively. It is this characteristic of digital images that allows computers to work their apparent magic in being able to transform images so quickly and completely.