Image forming apparatus with dot concentration

Details Image forming apparatus with dot concentration Image forming apparatus with dot concentration

1990-05-18

1992-07-14

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358457, 358 80, H04N 123, H04N 146

Patent

active

051308088

ABSTRACT:
An image forming apparatus for forming a color image from image data on an image having a plurality of colors. Density conversion information is stored with respect to pixel blocks having a predetermined phase and a predetermined configuration, which blocks are provided for each color. Pixel density values of image data items corresponding to each of the density conversion blocks are successively compared with a predetermined threshold value, and the compared image data item is converted according to the density conversion information if it is the case that pixel density is less than predetermined threshold value is satisfied, thereby limiting changes in color tones at a highlighted portion of the image and stabilizing the color tones.

REFERENCES:
patent: 4553173 (1985-11-01), Kawamura
patent: 4561025 (1985-12-01), Tsuzuki
patent: 4578713 (1986-03-01), Tsao
patent: 4733230 (1988-03-01), Kurihara et al.
patent: 4809063 (1989-02-01), Moriguchi et al.
patent: 4969053 (1990-11-01), Outa et al.
patent: 4974067 (1990-11-01), Suzuki et al.

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