Incremental printing of symbolic information – Ink jet – Controller
Patent
1992-08-05
1997-05-27
Fuller, Benjamin R.
Incremental printing of symbolic information
Ink jet
Controller
347 19, 358501, B41J 2205, B41J 29393, B41J 221, H04N 146
Patent
active
056336624
ABSTRACT:
A process is disclosed for controlling ink volume in liquid ink printing systems such as ink jet printers. The process examines the total ink volume per pixel as specified in source image data (typically 24-bit, three color data), i.e. before digital halftoning. For each pixel of data, the specified ink volume is compared to a selected maximum total ink volume per pixel. The maximum total ink volume is selected, depending upon the printing medium and environmental conditions, so as to provide good color coverage while avoiding curl, bleeding and other adverse effects of excessive ink volume. The source image ink volume is reduced so as to form depleted image data in which the ink volumes per pixel do not exceed the selected maximum. Preferably, a threshold ink volume also is selected, below which no ink limiting is applied, thereby avoiding washed-out images at lower ink volumes. Above the threshold, the ink volume is scaled to a value below the maximum, preferably by linear scaling.
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patent: 3684825 (1972-08-01), Dischert et al.
patent: 4631548 (1986-12-01), Milbrandt
patent: 4682186 (1987-07-01), Sasaki et al.
patent: 4930018 (1990-05-01), Chan et al.
patent: 5161974 (1992-11-01), Bowges
Allen William J.
Miller Steven O.
Fuller Benjamin R.
Hewlett--Packard Company
Yockey David
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