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Proceedings Paper

UltraColor: a new gamut-mapping strategy
Author(s): Kevin E. Spaulding; Richard N. Ellson; James R. Sullivan
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Paper Abstract

Many color calibration and enhancement strategies exist for digital systems. Typically, these approaches are optimized to work well with one class of images, but may produce unsatisfactory results for other types of images. For example, a colorimetric strategy may work well when printing photographic scenes, but may give inferior results for business graphic images because of device color gamut limitations. On the other hand, a color enhancement strategy that works well for business graphics images may distort the color reproduction of skintones and other important photographic colors. This paper describes a method for specifying different color mapping strategies in various regions of color space, while providing a mechanism for smooth transitions between the different regions. The method involves a two step process: (1) constraints are applied so some subset of the points in the input color space explicitly specifying the color mapping function; (2) the color mapping for the remainder of the color values is then determined using an interpolation algorithm that preserves continuity and smoothness. The interpolation algorithm that was developed is based on a computer graphics morphing technique. This method was used to develop the UltraColor gamut mapping strategy, which combines a colorimetric mapping for colors with low saturation levels, with a color enhancement technique for colors with high saturation levels. The result is a single color transformation that produces superior quality for all classes of imagery. UltraColor has been incorporated in several models of Kodak printers including the Kodak ColorEase PS and the Kodak XLS 8600 PS thermal dye sublimation printers.

Paper Details

Date Published: 10 April 1995
PDF: 8 pages
Proc. SPIE 2414, Device-Independent Color Imaging II, (10 April 1995); doi: 10.1117/12.206553
Show Author Affiliations
Kevin E. Spaulding, Eastman Kodak Co. (United States)
Richard N. Ellson, Eastman Kodak Co. (United States)
James R. Sullivan, Eastman Kodak Co. (United States)

Published in SPIE Proceedings Vol. 2414:
Device-Independent Color Imaging II
Eric Walowit, Editor(s)

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