Image rendering method and system using negative signals

Details Image rendering method and system using negative signals Image rendering method and system using negative signals

2006-02-28

2006-02-28

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Size, resolution, or scale control

C358S003300

Reexamination Certificate

active

07006244

ABSTRACT:
A xerographic marking device includes a source of pixels representative of digitized image information. A rendering image processor analyzes the pixels for an image characteristic, and based on the analysis assigns one of at least three values to each pixel. The three values are selected from a set of values representing positive, negative or neutral relative to a predetermined exposure bias. The device also includes an imaging output device which converts the values assigned to the pixels into areas of selective exposure on a charge retentive surface. A charge on the charge retentive surface such as a photoreceptor accordingly, includes an area of positive charge determined to electrostatically react with a charged monochrome marking agent or toner in a first manner, for example by attraction. The charge also includes a negative charge area which is determined to electrostatically react with the toner in an opposite manner, for example to repel toner. Optionally, the charge also includes an overshoot or super positive/super-negative area. The overshoot areas have stronger electrostatic reactions with the toner than their corresponding positive
egative charges.

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