Method and apparatus for error diffusion and undercolor removal/

Details Method and apparatus for error diffusion and undercolor removal/ Method and apparatus for error diffusion and undercolor removal/

1998-05-20

2000-12-05

Rogers, Scott

Facsimile and static presentation processing

Static presentation processing

Attribute control

358529, 358534, H04N 152, H04N 160

Patent

active

061574627

ABSTRACT:
A method and apparatus for printing a digital color images wherein the application of both colored inks and black ink to a common location is prevented to minimize ink usage, and to provide a more uniform distribution of black and colored pixels. Input pixel data is received at a first depth in terms of `c` bits per pixel, wherein `c` is an integer, for at least three color separations of a digital color image. Pixel data at the first depth of `c` bits per pixel is derived for a fourth separation of the digital color image based upon the pixel data of the three color separations. Error diffusion is performed on the pixel data of the fourth separation to redefine the pixel data at a second depth of `d` bits per pixel, where `d` is an integer and `d`<`c`. For each pixel of each of the three color separations, correspondingly located binary pixel data of the fourth separation is subtracted therefrom, and error diffusion is performed on the pixel data of each of the three color separations to redefine the pixel data of each pixel of each color separation in terms of `d` bits per pixel. The pixel data is output in terms of `d` bits per pixel for each of the three color separations and the fourth separation to an output device.

REFERENCES:
patent: 5521989 (1996-05-01), Fan
patent: 5565994 (1996-10-01), Eschbach
patent: 5838885 (1998-11-01), Shu et al.

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