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Printing Process for Half-Tone Images With Dot Overlapping (Forward Correcting)

IP.com Disclosure Number: IPCOM000044334D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Hehl, W: AUTHOR [+2]

Abstract

In the raster scanning of image originals, scanners supply percentage black levels (Fig. 1) in the order 1, 2, 3, 4, 5, 6 for the scan positions characterized by these figures. In each of the positions also marked 1, 2, 3, 4, 5, 6 a dot can be printed in the order of these numbers, with adjacent dots overlapping (Fig. 2). One individual dot has a predetermined black surface. If two dots overlap, the resulting overall black surface is smaller than twice the black surface of one single dot. With a corresponding computer-controlled printing process, it is possible to note for already printed dots the total amount of their black surfaces.

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Printing Process for Half-Tone Images With Dot Overlapping (Forward Correcting)

In the raster scanning of image originals, scanners supply percentage black levels (Fig. 1) in the order 1, 2, 3, 4, 5, 6 for the scan positions characterized by these figures. In each of the positions also marked 1, 2, 3, 4, 5, 6 a dot can be printed in the order of these numbers, with adjacent dots overlapping (Fig. 2). One individual dot has a predetermined black surface. If two dots overlap, the resulting overall black surface is smaller than twice the black surface of one single dot. With a corresponding computer-controlled printing process, it is possible to note for already printed dots the total amount of their black surfaces. If a new dot is to be printed, its resulting black surface, due to its overlapping with possibly already existing printed dots, will be smaller WS than if there had been no overlapping dot printing. With corresponding computer control it can be determined for an existing configuration of already printed dots of a table T1 which overall black surface would be obtained if a new dot would be printed in a predetermined position for a predetermined, already printed dot configuration. In this manner, it is possible to receive a forecast on the overall black level, based on a specific, already printed dot configuration, plus a dot still to be printed. The percentage black levels supplied by the scanner for the scanning positions 1, 2, 3, 4, etc., are accumulate...