Variable density under/overprinting maps for improving print...

Details Variable density under/overprinting maps for improving print... Variable density under/overprinting maps for improving print...

2006-05-16

2006-05-16

Coles, Edward (Department: 2622)

Facsimile and static presentation processing

Static presentation processing

Detail of image placement or content

C358S001400, C358S001140, C347S023000, C347S040000, C347S043000

Reexamination Certificate

active

07046389

ABSTRACT:
A swath printing system and under/overprinting method compensate for the effects of defective printing elements by adjusting the under/overprinting map used during printing regions of a uniform color, typically black, to minimize the adverse impact on print quality of unprinted “white space” caused by the defective printing elements. A printing element quality detector determines which printing elements are functional and which are defective. Based on this information, a print controller then selects or constructs an under/overprinting map having under/overprinting pixel positions chosen to reduce these adverse effects on print quality caused by the defective printing elements, thus maintaining high image quality for the printed output.

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