Method for reducing 2-color moire in 4-color printing

Details Method for reducing 2-color moire in 4-color printing Method for reducing 2-color moire in 4-color printing

1994-05-03

1995-01-10

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358536, H04N 146

Patent

active

053812476

ABSTRACT:
A method of halftone printing in four colors using, for cyan, magenta and black, halftone screens that will result in screening angles of 15, 45 and 75 degrees, as is the standard process in the art, and a halftone screen for yellow that will result in screening angles of 0, +60 and -60 degrees. This combination will diminish the 2 color moire patterns that result from the interaction between the yellow and one of the other colorants. The 0 and + or -60 degree screening angles are generated by using a screen that produces a four-centered cell having dots that are spaced to form hexagons, when the nearest neighbors of a central dot are connected by lines, as opposed to the conventional trapezoidal orientation.

REFERENCES:
patent: 4924301 (1990-05-01), Surbrook
patent: 5045931 (1991-09-01), Sakamoto
patent: 5155599 (1992-10-01), Delabastita

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