Digital photos actually started with videotapes. If you look at the film of a VHS tape, you cannot see individual images. Now look at a reel of film: each frame of the film can be seen. The VHS tape has to be decoded from a digital signal before images can be seen. The difference between digital and film photography is very similar. Digital photography got its start because of the space race. Governments realized that satellites launched into space could take photos from the air of enemy territory. However, film would not work because it would have to be physically brought back to earth for development. Therefore, digital means were created for taking pictures, which could then be beamed back to earth as a digital signal.
The other major development that paved the way for digital cameras was the scanner. Scanners detected different shades and intensities of light in a picture and convert it into a digital signal, much like cameras do today.
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