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Space-dependent color gamut mapping: a variational approach

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4 Author(s)
Kimmel, R. ; Comput. Sci. Dept., Technion - Israel Inst. of Technol., Haifa, Israel ; Shaked, D. ; Elad, M. ; Sobel, I.

Gamut mapping deals with the need to adjust a color image to fit into the constrained color gamut of a given rendering medium. A typical use for this tool is the reproduction of a color image prior to its printing, such that it exploits best the given printer/medium color gamut, namely the colors the printer can produce on the given medium. Most of the classical gamut mapping methods involve a pixel-by-pixel mapping and ignore the spatial color configuration. Recently proposed spatial-dependent approaches for gamut mapping are either based on heuristic assumptions or involve a high computational cost. In this paper, we present a new variational approach for space-dependent gamut mapping. Our treatment starts with the presentation of a new measure for the problem, closely related to a recent measure proposed for Retinex. We also link our method to recent measures that attempt to couple spectral and spatial perceptual measures. It is shown that the gamut mapping problem leads to a quadratic programming formulation, guaranteed to have a unique solution if the gamut of the target device is convex. An efficient numerical solution is proposed with promising results.

Published in:

Image Processing, IEEE Transactions on  (Volume:14 ,  Issue: 6 )

Date of Publication:

June 2005

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