Continuous-tone ink reduction

Details Continuous-tone ink reduction Continuous-tone ink reduction

1996-07-08

1999-02-16

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

395109, 395117, 395101, 358296, 358518, 347 15, 347 43, 347 5, 382162, B41B 1500, H04N 121, B41J 2938, G06K 900

Patent

active

058728961

ABSTRACT:
An ink-jet-printer driver employs clustered-dot dither to generate binary image signals that represent an image that has been adjusted for the ink-duty limit that must be imposed to avoid bleeding on some print media. Some image values that would result in ink duties that exceed the limit without adjustment are actually reduced by more than needed to meet the ink-duty limit. The resultant adjusted value is an increasing function of unadjusted value even for unadjusted values that exceed the ink-duty limit. To impose the limit, a Bayer dither process (94) receives an input that represents the ratio of ink-limit-adjusted ink duty to unadjusted ink duty. A gating operation (96) permits an ink request only at those locations where both dither processes (92 and 94) indicate that an ink is permitted.

REFERENCES:
patent: 5196056 (1993-03-01), Prasad
patent: 5353387 (1994-10-01), Petschik et al.
patent: 5384585 (1995-01-01), Okumura
patent: 5439515 (1995-08-01), Kurabayashi et al.
patent: 5461403 (1995-10-01), Wallace et al.
patent: 5563985 (1996-10-01), Klassen et al.
patent: 5633662 (1997-05-01), Allen et al.

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