Color spatial filtering for thermal ink jet printers

Details Color spatial filtering for thermal ink jet printers Color spatial filtering for thermal ink jet printers

1992-08-11

1995-06-27

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 43, 358518, 358529, B41J 221

Patent

active

054283779

ABSTRACT:
A color spatial filter for ink jet color printers, especially four color CYMK printers. The printer includes an enhanced print mode and associated logic circuitry which examines and corrects black pixel coloring to increase black picture quality and reduce intercolor bleeding. This is accomplished by examining a surrounding neighborhood of pixels around each pixel as they flow to a color swath print buffer and selecting a method of correcting the representation of each pixel, based on a set of predetermined rules, to produce black by choosing either K, a slow-drying high density ink, or CYM, a fast-drying ink having low intercolor bleeding to thereby control bleeding characteristics that provide the best copy quality images. A lookup table may be used for greater gradations of black representation. Alternatively, printing may be performed using a color printer having two black inks, each with different drying rates and picture qualities. In this case, the filter examines the color space pixel planes and enhances the image by updating the color space pixel planes with CYMK.sub.1 K.sub.2 based on each pixel and its associated neighborhood of values.

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