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Spectral reflection and dot surface prediction models for color halftone prints

[+] Author Affiliations
Roger D. Hersch

Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland

Patrick Emmel

Clariant International, Muttenz, Switzerland

Fabien Collaud

Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland

Frédéríque Crété

Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland

J. Electron. Imaging. 14(3), 033001 (August 11, 2005). doi:10.1117/1.1989987
History: Received October 01, 2004; Revised January 14, 2005; Accepted January 24, 2005; Published August 11, 2005; Online August 11, 2005
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The proposed new spectral reflection model enhances the classical Clapper-Yule model by taking into account the fact that proportionally more incident light through a given colorant surface is reflected back onto the same colorant surface than onto other colorant surfaces. It comprises a weighted mean between a component specifying the part of the incident light that exits through the same colorant as the colorant from which it enters (Saunderson corrected Neugebauer component) and a component specifying the part of the incident light whose emerging light components exit from all colorants (Clapper-Yule component). We also propose models for taking into account ink spreading, a phenomenon that occurs when printing an ink halftone in superposition with one or several solid inks. The ink-spreading model incorporates nominal-to-effective surface coverage functions for each of the different ink superposition conditions. A system of equations yields the effective ink surface coverages of a color halftone as a weighted mean of the ink surface coverages specific to the different superposition conditions. The new spectral reflection prediction model combined with the ink-spreading model yields excellent spectral reflection predictions for clustered-dot color halftones printed on an offset press or on thermal transfer printers.

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© 2005 SPIE and IS&T

Citation

Roger D. Hersch ; Patrick Emmel ; Fabien Collaud and Frédéríque Crété
"Spectral reflection and dot surface prediction models for color halftone prints", J. Electron. Imaging. 14(3), 033001 (August 11, 2005). ; http://dx.doi.org/10.1117/1.1989987


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