Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1990-03-16
1991-04-30
Hartary, Joseph W.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346140R, 358 75, 358 78, 364519, B41J 221
Patent
active
050122576
ABSTRACT:
In a color ink jet printing system, an image superpixel (84, 86, 88) consists of a 2 by 2 array of cells (1-4), each cell corresponding to a pixel area on the substrate (80). Each pixel (55) of graphics data is processed to form a 2 by 2 array of bit image data (40), for printing a corresponding superpixel image (68). A superpixel configuration (86), indicating cell location and color of drops of ink for forming a superpixel image, is defined for each desired image color. Superpixel configurations control printing so that drops of ink (Y,M,C) are deposited only an a diagonally adjacent pair of cells (1,4), with no more than two drops of ink per cell, and no more than three drops of ink per superpixel. This superpixel strategy provides for printed images (62,64) perceivable as having the desired image color and having good color saturation, while minimizing bleed across color field boundaries (66).
REFERENCES:
patent: 4412226 (1983-10-01), Yoshida
patent: 4593295 (1986-06-01), Matsufuji et al.
patent: 4617580 (1986-10-01), Miyakawa
patent: 4620196 (1986-10-01), Hertz et al.
patent: 4630076 (1986-12-01), Yoshimura
patent: 4673951 (1987-06-01), Motoh
patent: 4677571 (1987-06-01), Riseman
patent: 4714964 (1987-12-01), Sasaki
patent: 4748453 (1988-05-01), Lin et al.
Hewlett Packard Paintjet Manual excerpt dated Apr., 1987.
Lowe David J.
Pritchard Thomas B.
Hartary Joseph W.
Hewlett--Packard Company
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