Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-10-12
1991-05-28
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 78, 358 80, 358456, H04N 140
Patent
active
050198963
ABSTRACT:
This invention is a method for forming halftone data which is characterized in that when an original comprising color images of a continuous tone is scanned to obtain image signals, and the image signals are superposed with halftone screen signals which are electrically generated in order to form multicolor separated halftone gradation images which are reproducible by printing, the difference in percentage of blackened pixels between a first contact (dot matrix corner) and a second contact (dot matrix corner) in square dots is about 2% or higher. Further, this invention relates to a method for forming halftone data, which is that when an original comprising color images of a continuous tone is scanned to obtain image signals, and the image signals are superposed with halftone screen signals which are electrically generated in order to form multicolor separated halftone gradation images whch are reproducible by printing, the difference in dot percentage between one stage of dot where a blackened portion starts and another stage or where a whitened portion ends is about 2% or higher.
REFERENCES:
patent: 3922484 (1975-11-01), Keller
patent: 4543613 (1985-09-01), Sakamoto
patent: 4547814 (1985-10-01), Hirosawa
patent: 4635133 (1987-01-01), Nys et al.
patent: 4719506 (1988-01-01), Van Buren
patent: 4811108 (1989-03-01), Numakura et al.
patent: 4814797 (1989-03-01), Haneda et al.
Britton Howard W.
Fuji Photo Film Co. Ltd
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