Automatic algorithmic determination of process black over a colo

Details Automatic algorithmic determination of process black over a colo Automatic algorithmic determination of process black over a colo

1996-05-24

1998-07-21

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358518, 358530, 395116, H04N 140, H04N 146, G03F 308, G06F 1500

Patent

active

057841721

ABSTRACT:
A digital color printing method and system is described which automatically determines a mixture of colorants to compose a process black color, taking into account relevent printing characteristics of a color printer and the background color at the point on the page at which the process black is to be printed. In certain printing systems, printing problems can occur when process black, composed of a mixture of colorants such as cyan, magenta, yellow, and black, is printed over a color background. For example, in a xerographic color printing system, a process black containing all colorants at maximum or near-maximum value can sometimes produce objectionable deletions in a surrounding color field, caused by interference in the transfer of toner to the background color field due to the process black toner pile height. Excessive combined toner pile height can also create an unevenness in the final print. Similarly, ink jet color printing systems can experience smearing and spreading due to excessive ink coverage when printing four-color process blacks. A system is described which automatically detects objects commanded to be printed as process black and recalculates the composition of the process black based on both the background color at the current position on the page and a predetermined set of tolerances for a particular printer.

REFERENCES:
patent: 4500919 (1985-02-01), Schreiber
patent: 5231504 (1993-07-01), Magee
patent: 5588093 (1996-12-01), Harrington
patent: 5650942 (1997-07-01), Granger

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