Color digital halftoning using black and secondary color replace

Details Color digital halftoning using black and secondary color replace Color digital halftoning using black and secondary color replace

1994-01-27

1995-12-05

Ro, Bentsu

Facsimile and static presentation processing

Natural color facsimile

Color correction

358502, 358534, H04N 164

Patent

active

054734460

ABSTRACT:
Provided is a system and method for selectively enabling a printer to deposit on a sheet cyan, magenta, yellow and black (C,M,Y and K) primary or black color dots at each of the plurality of pixel locations to produce a color image. The system comprises a memory for storing C, M, Y and K values for each pixel in the color image and a processor for controlling selective deposition of the C, M, Y and K colors. The system includes a memory for holding a color vector for each pixel, respectively in the color image; a memory for storing parameters of a dither cell; and a processor coupled to the memory for comparing the dither cell with each color vector, to select a color component to print at the corresponding pixel location based on the comparison. The system provides a halftoning technique that produces print quality near error diffusion quality with the speed of a dither by dithering on a color vector. The replacement of black and secondary colors by the system produces better print quality than other dither techniques.

REFERENCES:
patent: 4751535 (1988-06-01), Myers
patent: 5166809 (1992-11-01), Surbrook
patent: 5301269 (1994-04-01), Alcorn et al.

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