duplicating

Definition: Process of making duplicate of original photograph - usually transparency or negative. * Two methods (1) ANALOGUE uses traditional photographic means -- camera, lens and special duplicating film. Advantages (a) cheap to set up and produce many copies (b) ability to change colour balance. * Disadvantages (a) loss in image quality (b) impossible to correct faults such as cracks or dust-specks (c) difficult to control contrast (d) difficult to alter colour in specific area. (2) DIGITAL scans the original to create the digital image or facsimile of the original: result can then be printed out on film to create final duplicate. * Advantages: can improve on original; possible to correct faults; can change colours locally; can control contrast precisely. * Disadvantages (a) extremely expensive in equipment and (b) the operation too slow for economic production of multiple copies.

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