Controlling ink migration and physical color gamut discontinuiti

Details Controlling ink migration and physical color gamut discontinuiti Controlling ink migration and physical color gamut discontinuiti

1995-03-10

1999-01-19

Yockey, David F.

Incremental printing of symbolic information

Ink jet

Controller

347 43, 358529, 395109, B41J 2205, B41J 221, G03F 308, G05B 1500

Patent

active

058618961

ABSTRACT:
In color graphics printing, incompatible inks, such as true black and color inks, tend to bleed across color field boundaries. Moreover, in four-color systems, there is a discontinuity in the physical color gamut, as distinguished from the logical color gamut, associated with the redundant color. A method is disclosed for alleviating both problems by adjusting image data prior to dithering. The method slightly shifts the logical color indicated in the image data so as to avoid the discontinuity that arises with neutral colors. Preferably, in a four-color printing system, yellow is depleted in the image data, so that after dithering, more dots of blue ink are printed in a given area than would be printed otherwise. For each pixel, the amount of correction is inversely related to the color saturation. The presence of blue ink dots within the substantially black field reduces bleed along the field edges.

REFERENCES:
patent: 4656505 (1987-04-01), Yamada et al.
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patent: 4953015 (1990-08-01), Hayasaki et al.
patent: 4994901 (1991-02-01), Parulski et al.
patent: 5038208 (1991-08-01), Ichikawa et al.
patent: 5057852 (1991-10-01), Formica et al.
patent: 5168552 (1992-12-01), Vaughn et al.

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