Color image processing apparatus with processing means for selec

Details Color image processing apparatus with processing means for selec Color image processing apparatus with processing means for selec

1993-07-12

1996-05-07

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347251, 358298, H04N 121

Patent

active

055150969

ABSTRACT:
A color image processing apparatus where in the event of reproducing an image which has undergone an adaptive character-area processing with toner of four colors, the optimum filtering and halftone processing are performed depending upon the colors of the toner so that a high-grade color image which contains solid black characters having no blur can be obtained. For color image data of various colors including yellow, magenta, cyan and black for toner development, a coefficient of a filtering circuit (6) and a characteristic of a halftone processing circuit (8) are changed so as to practice a filtering and halftone processing for a character mode to the color image data of black, or practice the filtering and halftone processing for a photograph mode to the color image data other than black. In this way, even if a color photograph image contains images of black solid characters, the color photograph image can be reproduced into multi-leveled gradation, and moreover, the black solid character images contained therein can be reproduced having no blur with color with high resolution.

REFERENCES:
patent: 5134667 (1992-07-01), Suzuki
patent: 5357353 (1994-10-01), Hirota
patent: 5387983 (1995-02-01), Sugiura et al.
patent: 5398124 (1995-03-01), Hirota
Patent Abstracts of Japan, vol. 15, No. 240 (E-1079) 20 Jun. 1991 & JP-A-03 072 778 (Fuji Xerox Co., Ltd.) 27 Mar. 1991.
English Abstract corresponding to Japanese unexamined Patent Publication No. 230678/1991.

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