Typewriting machines – Including control of format by programmed-control-system
Reexamination Certificate
2002-10-25
2004-10-05
Chau, Minh (Department: 2854)
Typewriting machines
Including control of format by programmed-control-system
C400S061000, C347S015000, C347S043000
Reexamination Certificate
active
06799912
ABSTRACT:
BACKGROUND OF THE DISCLOSURE
The subject disclosure is directed generally to raster printing enhanced black, and more particularly to selectively printing enhanced black.
Raster printing systems accomplish printing by forming small marks or dots at selected pixel locations, and are commonly implemented as electrophotographic printers and ink jet printers. In raster printing systems, it is known to print one or more non-black color dots (e.g., cyan, magenta or yellow) with black dots, for example to improve black density and uniformity in dark gray regions. However, since color-to-color registration can be less than ideal, it may be preferable not to add non-black color to black near edges where color fringes will tend to show if mis-registration is present. This can be particularly important in light half-toned grays where even a slight mis-registration could induce a noticeable hue shift.
While there are known techniques directed to reducing color fringes, they can be complex and computationally expensive.
REFERENCES:
patent: 5821957 (1998-10-01), Berge et al.
patent: 6183062 (2001-02-01), Curtis et al.
patent: 6186615 (2001-02-01), Sato et al.
patent: 6250733 (2001-06-01), Yao et al.
patent: 6373594 (2002-04-01), Yao et al.
Chau Minh
Quiogue Manuel
Xerox Corporation
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