Photocopying – Projection printing and copying cameras – Methods
Patent
1976-08-10
1978-05-30
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Methods
355 68, G03B 2732, G03B 2774
Patent
active
040920674
ABSTRACT:
A method of controlling exposure in the production of photographic prints by scanning an original point-by-point and determining the neutral density of each point of the picture, the densities being processed to provide exposure data to control the exposure of sensitized paper to produce a print from the original. To provide the optimum print quality as required by this method, the picture area of the original is divided up into zones, each of which is at least two picture points, the density values obtained by scanning the original are processed with a density value of a point in a reference picture to provide intermediate density values for each zone in accordance with processing instructions which vary from zone to zone, the intermediate values then serving to form an end density value to control the exposure of the print material. When printing in color the color original is scanned to provide density values in each of the three primary colors at each point of a zone and the three color density signals are then similarly processed to provide the exposure data for the color print material.
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patent: 3790275 (1974-02-01), Hubol et al.
patent: 3888580 (1975-06-01), Amano et al.
Gretag Aktiengesellschaft
Griffin Donald A.
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