Prediction model for color separation, calibration and...

Facsimile and static presentation processing – Static presentation processing – Attribute control

Reexamination Certificate

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C358S001100, C358S504000, C358S518000, C347S054000

Reexamination Certificate

active

07423778

ABSTRACT:
The present invention facilitates the calibration of printers and the color separation of input images into a set of inks by disclosing methods and systems for populating device-calibration lookup tables. The disclosed methods and systems rely on a comprehensive spectral prediction model predicting at a high accuracy the reflectance spectra of halftone ink patches. The spectral prediction model is composed of a first part predicting the reflection spectra as a function of physical (mechanical) surface coverages and of a second part comprising functions mapping nominal surface coverages to effective surface coverages for halftone patch wedges printed alone and halftone patch wedges printed in superposition with one or several solid inks. In addition, the disclosed methods and systems can be used to control printer actuation parameters in different types of printers e.g. liquid ink professional printers (offset, gravure, letterpress), electrophotographic printers, ink-jet printers, Thermal transfer printers and dye-sublimation printers.

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