Controlling printing exposure using point-by-point scanning

Details Controlling printing exposure using point-by-point scanning Controlling printing exposure using point-by-point scanning

G - Physics

03

B

95/28, 95/3

G03B 27/32 (2006.01) G03B 27/73 (2006.01) G03B 27/74 (2006.01)

Patent

CA 1074163

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 sensitised 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 tones, each of which as 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 colour the colour original is scanned to provide density values in each of the three primary colours at each point of a zone and the three colour density signals are then similarly processed to provide the exposure data for the colour print material.

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