JPH0554755B

PURPOSE:To improve the purity and to obtain a fine copy, by reducing the printing density of cyan C which includes magenta as unnecessary factor Cm which is identified by detecting the negative part of the magenta M. CONSTITUTION:In a correction circuit, the three primary color signal R-B is supplie...

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Bibliographic Details
Main Authors EGUCHI YASUHITO, SHINDO MITSUYOSHI
Format Patent
LanguageEnglish
Published 13.08.1993
Edition5
Subjects
APPARATUS SPECIALLY ADAPTED THEREFOR
CINEMATOGRAPHY
CORRECTION OF TYPOGRAPHICAL ERRORS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
ELECTROGRAPHY
HOLOGRAPHY
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
LINING MACHINES
MATERIALS THEREFOR
ORIGINALS THEREFOR
PERFORMING OPERATIONS
PHOTOGRAPHY
PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
PRINTING
SELECTIVE PRINTING MECHANISMS
STAMPS
TRANSPORTING
TYPEWRITERS
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Summary:PURPOSE:To improve the purity and to obtain a fine copy, by reducing the printing density of cyan C which includes magenta as unnecessary factor Cm which is identified by detecting the negative part of the magenta M. CONSTITUTION:In a correction circuit, the three primary color signal R-B is supplied from a signal source 1 to a logarithm conversion circuit 31-33, and converted into density signals cyan C, magenta M and yellow Y. They are supplied to a matrix calculation circuit 41-43 and converted into signals C-M with masking correction. The corrected signal M is supplied to a detection circuit 62, and the negative part generated to the signal M is detected, and supplied to an adding circuit A1. An attenuator 72 is used to decide the volume to be reduced of the cyan C at the time of printing according to negative part generated to the signal M. From the adding circuit A1, the masking correction as well as the signal C with purity correction are picked up.
Bibliography:Application Number: JP19840252133