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专利名称：Prediction model for color separation,
calibration and control of printers
发明人：Roger David Hersch,Patrick Emmel,Fabien
Collaud
申请号：US10631743申请日：20030801
公开号：US20050083540A1公开日：20050421
专利附图：
摘要：The present invention facilitates the calibration of printers and the colorseparation 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 ona comprehensive spectral prediction model which is capable of predicting at a highaccuracy the reflectance spectra of halftone ink patches. The comprehensive spectralprediction model is composed of a first part predicting the reflection spectra as afunction of physical (mechanical) surface coverages and of a second part comprisingfunctions mapping nominal surface coverages to effective surface coverages. Thesemapping functions are calibrated by halftone patch wedges printed alone and by half-tone patch wedges printed in superposition with one or several solid inks. The part of thecomprehensive spectral prediction model predicting the reflection spectra relies on aweighted average between one component behaving according to the Clapper-Yulemodel and another component behaving as the spectral Neugebauer model, extendedto include multiple internal reflections at the paper-air boundary. The disclosed methodsand systems can perform the color separation as well as the calibration of printersprinting with standard cyan, magenta, and yellow inks as well as with inks comprisingstandard and non-standard inks such as Pantone inks (custom inks). They are also usedfor performing precise undercolour removal in order to carry out the color separation ofimages into cyan, magenta, yellow and black inks. They can further be used to carry outthe color separation of images into cyan, magenta, yellow, black, light cyan and lightmagenta inks. In addition, the disclosed methods and systems can be used for printercontrol, i.e. to control printer actuation parameters in different types of printers e.g.liquid ink professional printers (offset, gravure, letterpress), electrophotographicprinters, ink-jet printers, thermal transfer printers and in dye-sublimation printers.
申请人：Roger David Hersch,Patrick Emmel,Fabien Collaud
地址：Epalinges CH,Pratteln CH,Nyon CH
国籍：CH,CH,CH
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