gamma img processing,uv imaging,visible imaging,microband wave imaging etc etc
Lot's of photographers use digital image processing as opposed to old fashioned because you can do non-destructive editing and come back at a later time and make changes. Using the old fashioned way...
Easy to manipulate. Compact storage. (those are also the disadvantages)
It is the processing (changing) of color images using a computer.
Digital uses mega pixels ... vs film resolution is based on the area u have to record the image