Color boundary enhancement in a multi-color electrostatic printe

Details Color boundary enhancement in a multi-color electrostatic printe Color boundary enhancement in a multi-color electrostatic printe

1992-09-03

1993-10-12

Fuller, Benjamin R.

Recorders

Electric recording

Electrochemical

346 11, 346108, 358500, 358518, 358300, G01D 1506

Patent

active

052529959

ABSTRACT:
A multi-color, electrostatic, laser printing system employs a method for enhancing color representations at boundaries of pixels with different colors. The system employs a charged electrostatic surface that is selectively discharged by application of a modulated laser beam. The system performs the steps of: identifying a pixel of a first color that bounds a pixel of a second color, the first color being a secondary color; decreasing applied laser power to the electrostatic surface at the secondary color pixel site in the process of applying underprint and overprint toners to produce the secondary color; and inhibiting the decrease of applied laser power when applying the overprint toner if the second color pixel is a primary color that is the same as the color of the overprint toner of the secondary color pixel. A similar inhibition action occurs when an isolated primary color pixel or a thin pixel line is found so as to assure proper development.

REFERENCES:
patent: 4894665 (1990-01-01), Davis
patent: 4949184 (1990-08-01), Suzuki

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