Is it possible to improve the weighting function for lightness in the CIEDE2000 color-difference formula?

Authors

  • Manuel Melgosa University of Granada, Department of Optics, Faculty of Sciences, 18071 Granada, Spain
  • Guihua Cui University of Wenzhou, Department of Information & Communication Engineering, School of Physics and Electronic Information Engineering, Wenzhou 325035, China
  • Claudio Oleari Università degli Studi di Parma, Department of Physics, I-43100 Parma, Italy
  • Pedro J. Pardo University of Extremadura, Department of Physics, Faculty of Sciences, 06071 Badajoz, Spain
  • Min Huang Beijing Institute of Graphic Communication, Beijing 102600, China
  • Changjun Li University of Science and Technology Liaoning, School of Electronics and Information Engineering, Anshan 114051, China
  • Ming Ronnier Luo Zhejiang University, State Key Laboratory of Modern Optical Instrumentation, Hangzhou, China - University of Leeds, Leeds LS2 9JT, United Kingdom

DOI:

https://doi.org/10.23738/ccsj.i102018.07

Keywords:

Color difference, Color-difference formula, CIE94, CIEDE2000, Whittle formula

Abstract

 

 We have compared the performance of the CIEDE2000 color-difference formula (?E00) with three CIEDE2000-modified formulas: 1) ?E00_M1, which incorporates a new V-shaped function proposed at the University of Leeds (UK) with a minimum at the specific lightness of the background; 2) ?E00_M2, a formula where the original SL function in ?E00 was replaced by SL=1, as proposed by the CIE94 color-difference formula; 3) ?E00_M3, a formula developed by us, with the same structure than ?E00, but avoiding its original SL function by replacing the lightness differences in CIELAB by a new lightness definition based on Whittle formula. Our comparison used the STRESS index and thirteen visual datasets (CIE 217:2016), including filtered subsets to test the symmetry of the SL function proposed by ?E00. None of the three mentioned CIEDE2000-modified formulas performed statistically significantly better than the original ?E00 formula for any of the mentioned datasets or subsets, with only one exception (?E00_M2 formula, Witt dataset). Therefore, the replacement of the SL function in ?E00 by SL=1 is not recommended. ?E00_M1 and ?E00_M3 improved ?E00 for most datasets, but such improvements were not statistically significant. Results for color pairs with average L* values below and above 50 were not statistically significant different for neither ?E00, ?E00_M2 and ?E00_M3 formulas. It is interesting to note that for eight of the thirteen visual datasets there were no color pairs with average L* values below 25, which claims for future studies using darker color pairs. 

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Published

2018-12-01

How to Cite

Melgosa, M., Cui, G., Oleari, C., Pardo, P. J., Huang, M., Li, C. and Ronnier Luo, M. (2018) “Is it possible to improve the weighting function for lightness in the CIEDE2000 color-difference formula?”, Cultura e Scienza del Colore - Color Culture and Science, 10, pp. 59–65. doi: 10.23738/ccsj.i102018.07.

Issue

Vol. 10 (2018)

Section

Papers

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