Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1987-06-05
1990-11-27
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358458, H04N 146
Patent
active
049740679
ABSTRACT:
A digital image processing method and an apparatus for the same which separate an original image into a plurality of color components to thereby produce image data each being associated with a respective one of the color components. The image data are individually processed to provide record color component density data. One halftone representation pattern is specified on a color component basis by the record color component density data to record that pattern. In color-by-color halftone data processing, there are used halftone representation patterns which are different in the positions of tone rendering spots from one color to another. Each of the record density data is extracted by assigning a particular area of the pattern thereto. The halftone representation patterns adapted to record a first and a second color which degrade color reproducibility when mixed together, e.g., those for magenta and cyan are provided with the centers of the above-mentioned spots at different positions from each other. The halftone representation patterns for recording a third color such as yellow have spots the centers of which are distributed between those of the patterns adapted for the first and second colors. The methodology and apparatus provide for the suppressing of overlapping of colors in a low density range despite the use of the same density pattern by changing the pattern phase, color by color and in addition implementing variable magnification recording of a high quality color image by use of a submatrix type recording system.
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Murayama Noboru
Suzuki Koichi
Groody James J.
Powell Mark R.
Ricoh & Company, Ltd.
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