Intermediate gradient image producing method

Details Intermediate gradient image producing method Intermediate gradient image producing method

1984-04-23

1987-01-06

Miller, Jr., George H.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346 11, 358 75, G01D 1518, H04N 146

Patent

active

046350780

ABSTRACT:
A color image reproducing method uses at least cyan, magenta and yellow colorants, in which at least one color among them has a plurality of kinds of coloring densities. According to this method, various microdots having different densities are formed; sizes of these dots are variably controlled; one pixel consisting of a plurality of cells is provided; the frequency of occurrences in one pixel of the microdots of the high density colorant and of the microdots of the low density colorant is varied in accordance with a reproduction density; and the thick microdot and thin microdot have sizes so as to reproduce almost the same reflection optical density. An intermediate region which is not included in any of the density reproduction ranges of the high and low density colorants is set, and this mid-density region is reproduced using both of the microdots of the high density colorant and the microdots of the low density colorant. A dither matrix method may be used for this reproduction. As a result, false profiles can be prevented and a color picture image with high gradient and high quality is derived.

REFERENCES:
patent: 4412225 (1983-10-01), Yoshida et al.
patent: 4412226 (1983-10-01), Yoshida
patent: 4446470 (1984-05-01), Sugiyama et al.
patent: 4494128 (1985-01-01), Vaught
patent: 4499479 (1985-02-01), Chee-Shuen Lee et al.

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