Image Digitisers are utilised in a similar fashion to audio digitisers. A single image from a photograph or video camera is converted into digital form. Once in this form the picture may be edited in an endless number of ways with a digital `paintbox' system. The photograph images you see in this title are digital versions of standard 35mm photographs.
Images are converted into digital form by a three pass system, one for each primary colour; red, green and blue. The voltage which represents the luminance of video at any given point in the image is then stored as a digital number. For any point on an image there will be three stored numbers, one for each primary colour. The image can be rebuilt and displayed by reversing this process. The larger the number used for digital storage, the more accurate the resulting picture when it is re-displayed.
