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Volume: 18 | Article ID: art00042
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Improving Perceptual Uniformity of Sampling in Color Look-up Tables
Rohit A. Patil
Maxim W. Derhak
  DOI :  10.2352/CIC.2010.18.1.art00042  Published Online :  January 2010
Abstract

Color look-up tables (CLUTs) are frequently used to embed pre-computed transformations between a colorimetric space (e.g. CIELAB) and a device space (e.g. CMYK). The sampling method used to populate a CLUT has a significant impact on its accuracy and its error distribution. This paper discusses sampling methods of CLUTs which convert CIELAB space to device space. Based on the discussion, a new sampling method to achieve better perceptual uniformity of sampling between grid points is proposed. The method uses CIEDE2000 color difference equation to sample the grid points along a* and b* dimensions in a way that the distance between the grid points along these dimensions is more perceptually equal. Using such a strategy improves the interpolation accuracy of neutral colors while keeping the CLUT size unchanged.

Journal Title : Color and Imaging Conference
Publisher Name : Society of Imaging Science and Technology
Publisher Location : 7003 Kilworth Lane, Springfield, VA 22151, USA
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 DOI 10.2352/CIC.2010.18.1.art00042
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Rohit A. Patil, Maxim W. Derhak, "Improving Perceptual Uniformity of Sampling in Color Look-up Tables"  in Proc. IS&T 18th Color and Imaging Conf.,  2010,  pp 238 - 243,  https://doi.org/10.2352/CIC.2010.18.1.art00042

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Copyright © Society for Imaging Science and Technology 2010
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Color and Imaging Conference
color imaging conf
2166-9635
Society of Imaging Science and Technology
7003 Kilworth Lane, Springfield, VA 22151, USA
2166-9635(20100101)2010:1L.238;1-
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Articles
Improving Perceptual Uniformity of Sampling in Color Look-up Tables
PatilRohit A.
DerhakMaxim W.
01012010
2010
1
238
243
2010
Color look-up tables (CLUTs) are frequently used to embed pre-computed transformations between a colorimetric space (e.g. CIELAB) and a device space (e.g. CMYK). The sampling method used to populate a CLUT has a significant impact on its accuracy and its error distribution. This paper discusses sampling methods of CLUTs which convert CIELAB space to device space. Based on the discussion, a new sampling method to achieve better perceptual uniformity of sampling between grid points is proposed. The method uses CIEDE2000 color difference equation to sample the grid points along a* and b* dimensions in a way that the distance between the grid points along these dimensions is more perceptually equal. Using such a strategy improves the interpolation accuracy of neutral colors while keeping the CLUT size unchanged.