Color image printing apparatus

Recorders – Plural-function recorder – distinguishable recordings – Records distinguishable by color

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346 76PH, 358 75, 358298, 358456, 358476, 400120, 430 44, 430293, G01D 1510, H04N 123, G03C 500

Patent

active

048840807

ABSTRACT:
A color image printing apparatus prints one pixel by superposing a predetermined dots of three colors within a 3.times.3 dot matrix in accordance with a density of the pixel. The positions of the printed dots within the dot matrix are stored as a dot pattern for each color. One dot pattern is used for each of a plurality of densities included in one density range. The printing energy for each of the dots included in the dot pattern is controlled in accordance with the density level of the pixel. The dot pattern is different for each color and three dot patterns are stored for each color and for each density range. These three dot patterns are repeatedly used for every three pixels which are continuous in the horizontal direction. These three dot patterns have two or three texture directions. The texture direction other than the vertical direction is different for each color.

REFERENCES:
patent: 3922484 (1975-11-01), Keller
patent: 4333112 (1982-06-01), Matsumoto
patent: 4368491 (1983-01-01), Saito
patent: 4394693 (1983-07-01), Shirley
patent: 4412225 (1983-10-01), Yoshida et al.
patent: 4477833 (1984-10-01), Clark et al.
patent: 4486788 (1984-12-01), Yamada
patent: 4532523 (1985-07-01), Tanaka
patent: 4536771 (1985-08-01), Tanaka
patent: 4578713 (1986-03-01), Tsao et al.
patent: 4668978 (1987-05-01), Gorita
patent: 4724446 (1988-02-01), Hirahara et al.
Proceedings of the 1'st Non-Impact Printing Technologies Symposium, 3-6, pp. 51-54 (In Japanese); O. Asada et al.; 1984-7-24.

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