All-device-space automatic black replacement

Details All-device-space automatic black replacement All-device-space automatic black replacement

2006-08-08

2006-08-08

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S002100, C358S529000, C358S515000

Reexamination Certificate

active

07088470

ABSTRACT:
A direct device-space-to-device-space transform adjusts the amount of actual black ink, to avoid highlight and midtone granularity in incremental printing—but with no need for translation into perceptual space. If the amount of black ink specified in the input data for a particular color is very small or very large, then that specified color is passed through the transform without substantial change. Thereby the amount of actual black ink and other colorants is held as nearly as practical at levels dictated by device-space input specifications while minimizing visible granularity. Replacement behavior is chosen to smoothly blend between different kinds of operation in different tonal ranges. This system accommodates personnel trained in classical printing-press technologies, who are accustomed to full control over amounts of black and other colorants.

REFERENCES:
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patent: 5329385 (1994-07-01), Washio
patent: 5359437 (1994-10-01), Hibi
patent: 6118550 (2000-09-01), Hayashi
patent: 6499829 (2002-12-01), Tabata et al.
patent: 6665096 (2003-12-01), Oh

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