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Proceedings Paper

Model for halftone color prediction from microstructure
Author(s): A. Ufuk Agar
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Paper Abstract

In this work, we take a microstructure model based approach to the problem of color prediction of halftones created using an inkjet printer. We assume absorption and scattering of light through the colorant layers and model the subsurface light scattering in the substrate by a Gaussian point spread function. We restrict our analysis to transparent substrates. To model the absorption and scattering of light through the colorant layers, we employ the Kubelka-Munk color mixing mode. To model the scattering in the substrate and to predict the spectral distribution, we use a wavelength dependent version of the reflection prediction model developed by Ruckdeschel and Hauser. Using spectral distributions and ink weight measurements for transparencies completely and homogeneously coated with colorants, we compute the absorption and scattering spectra of the colorants using the Kubelka-Munk theory. We train our model using measured spectral distribution and synthesized microstructure images of primary ramps printed on transparent media. For each patch in the primary ramp, we synthesize a high-resolution halftone microstructure image from the halftone bitmap assuming dot profiles with Gaussian roll-offs, form which we compute a high-resolution transmission image using the Kubelka-Munk theory and the absorption and scattering spectra of the colorants. We then convolve this transmission image with the Gaussian point spread function of the transparent substrate to predict the average spectral distribution of the halftone. We use our model to predict the spectral distribution of a secondary ramp printed on the same media.

Paper Details

Date Published: 21 December 2000
PDF: 6 pages
Proc. SPIE 4300, Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts VI, (21 December 2000); doi: 10.1117/12.410816
Show Author Affiliations
A. Ufuk Agar, Hewlett-Packard Labs. (United States)


Published in SPIE Proceedings Vol. 4300:
Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts VI
Reiner Eschbach; Gabriel G. Marcu, Editor(s)

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