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Journal of Electronic Imaging • Open Access

Misregistration sensitivity in clustered-dot color halftones

Paper Abstract

Halftoned separations of individual colorants, typically cyan, magenta, yellow, and black, are overlaid on a print substrate in typical color printing systems. Displacements between these separations, commonly referred to as “interseparation misregistration," can cause objectionable color shifts in the prints. We study this misregistration-induced color shift for periodic clustered-dot halftones using a spatiospectral model for the printed output that combines the Neugebauer model with a periodic lattice representation for the individual halftones. Using Fourier analysis in the framework of this model, we obtain an analytic characterization for the conditions for misregistration invariance in terms of colorant spectra, periodicity of the individual separation halftones, dot shapes, and misregistration displacements. We further exploit the framework in a hybrid analytical-numerical simulation that allows us to obtain quantitative estimates of the color shifts due to misregistration, thereby providing a characterization for these shifts as a function of the optical dot gain, halftone periodicities, spot shapes, and interseparation misregistration amounts. We present simulation results that demonstrate the impact of each of these parameters on the color shift and demonstrate qualitative agreement between our approximation and experimental data.

Paper Details

Date Published: 1 April 2008
PDF: 30 pages
J. Electron. Imag. 17(2) 023004 doi: 10.1117/1.2917517
Published in: Journal of Electronic Imaging Volume 17, Issue 2
Show Author Affiliations
Basak Oztan, Univ. of Rochester (United States)
Gaurav Sharma, Univ. of Rochester (United States)
Robert Paul Loce, Xerox Corp. (United States)

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