|.....Digital Imaging products like Photo CD and the IMP on MESUR Pathfinder, enable us to capture and store film images electronically, then process them on a computer, much like we process text and drawings.
An image on film is represented electronically by continuous analog wave forms. A digital image is represented in a binary number sequence, stored in computer's memory. A digital image is derived from sampling the analog image.
Analog values are continuous. Digital values are discrete electronic pulses that have been translated into strings of zeros and ones -- the only integers in a binary system.
Before we take a closer look at the photographic digital image, we need to understand the diiference between two ways a computer stores image data: Vector and Raster graphics.