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Proceedings Paper

Rendering of color on scattering media
Author(s): Bjoern Kruse; Stefan Gustavson
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Paper Abstract

Rendering of halftone images on scattering media such as paper is subject to dot gain. Physical dot gain is caused by the mechanical and chemical properties of the paper, the ink and the printing device, whereas optical dot gain depends on the optical properties of the medium. Media such as semitransparent film and paper show a pronounced internal scattering. Light incident on the surface of such a medium is in part reflected at the surface, but most of it enters the medium. That light is diffused by multiple internal scattering before it either re- emerges at the surface, penetrates through to the opposite side of the medium, or is absorbed. Because of this diffusion, a narrow beam of light entering the surface will be reflected with a 'halo' around the point of entry, which is precisely what causes the optical dot gain. In this paper we present a model for the optical dot gain on scattering media that enables us to predict color shifts in the rendering as caused by different raster technologies. The model is based on a non-linear application of a point spread function to the flux of light falling upon the medium surface. The point spread function has been established using a supercomputer simulation. The model has been successfully used to predict dot gain in monochromatic halftone prints and may be used for color prints as well. Simulations show that in color printing, dot gain can actually increase the color gamut. The results have obvious implications for the modeling of color printing and the strategies for device independent color management for color hardcopy, and may also be used in conjunction with segmentation of colors on scattering media.

Paper Details

Date Published: 22 April 1996
PDF: 10 pages
Proc. SPIE 2657, Human Vision and Electronic Imaging, (22 April 1996); doi: 10.1117/12.238738
Show Author Affiliations
Bjoern Kruse, Linkoping Univ. (Sweden)
Stefan Gustavson, Linkoping Univ. (Sweden)

Published in SPIE Proceedings Vol. 2657:
Human Vision and Electronic Imaging
Bernice E. Rogowitz; Jan P. Allebach, Editor(s)

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