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Proceedings Paper

Dithering in color simplexes
Author(s): Doron Shaked; Zachi Z. Baharav; Nur Arad
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Paper Abstract

Monochrome dither halftoning is a gray-scale image rendering procedure where gray-levels in an image are compared against a periodic threshold array, placing a Black dot in every location whose gray-level is smaller than the corresponding threshold value. Current generalization to color printing result in Cartesian thresholding procedures, namely RGB values are compared component-wise to trivariate thresholds. In this report we develop a color dithering framework based on a non-Cartesian coordinate system. To this end we generalize multidimensional dithering in a non-separable manner, and define it only as a space-varying point- operator. Three dithering methods are proposed within this framework. The main advantage of simplex dither over the traditional Cartesian dither is that it allows the rendition of solid color patches while using no more than a preselected quadruple of colors, thereby enabling a reduction in halftone noise.

Paper Details

Date Published: 21 December 1999
PDF: 10 pages
Proc. SPIE 3963, Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts V, (21 December 1999); doi: 10.1117/12.373420
Show Author Affiliations
Doron Shaked, Hewlett-Packard Co. (Israel)
Zachi Z. Baharav, Hewlett-Packard Co. (United States)
Nur Arad, Hewlett-Packard Co. (Israel)

Published in SPIE Proceedings Vol. 3963:
Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts V
Reiner Eschbach; Gabriel G. Marcu, Editor(s)

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