Banding and ink-bleeding reduction in cluster dither by screen d

Details Banding and ink-bleeding reduction in cluster dither by screen d Banding and ink-bleeding reduction in cluster dither by screen d

1996-10-24

1998-08-18

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358534, G06F 1500

Patent

active

057969299

ABSTRACT:
A controller for an ink-jet printer (26) half-tones three color-component values in clustered-dot dither operations (80, 82, and 84) that employ respective dither arrays whose cluster centers are displaced from each other. Additionally, a half-toning operation (86) is performed on a fine-resolution black value obtained from the color-component values in an undercolor-removal operation (59) in which the resultant black value is less, throughout most of the component-value range, than the minimum of the color-component values from which the black value is derived. The banding effects that would otherwise result from ink bleeding are thereby greatly reduced. The banding effects can be further reduced by performing black-component half-toning in a non-cluster-dot-dither operation, without detracting significantly from the intended clustered-dot dither effect.

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