Image forming apparatus

Details Image forming apparatus Image forming apparatus

1995-03-21

1998-01-06

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347131, B41J 247

Patent

active

057060460

ABSTRACT:
An image forming apparatus including a bit map data generating section for generating binary dot data for each color from image data, an image memory for storing the dot data, an edge dot discriminating section for discriminating edge dots positioned in an edge section, such as a curved-line section, a slanted-line section of characters, graphics, photo images, etc. in dot data for black stored in the image memory, and a dot modulating circuit for modulating the dot data so that the edge dots and printing dots other than black ones become smaller than black printing dots other than the edge dots. With this arrangement, since linear tone can be obtained even in a section with a deep color, excellent tone can be obtained in multi-color printing such as full-color printing. Therefore, reproducibility of tone of binarized image data can be improved, and jaggedness in an edge section can be improved so as to have a smooth line.

REFERENCES:
patent: 5005139 (1991-04-01), Tung
patent: 5029108 (1991-07-01), Lung
patent: 5252995 (1993-10-01), Trask et al.
patent: 5325474 (1994-06-01), Kumazaki et al.
patent: 5357583 (1994-10-01), Sato et al.

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