Color difference measurements using 9-steps gray scales

M. Melgosa , J. Romero , R. Huertas , L. Gómez-Robledo P. A. García , D Khaustova , S. Q. Bukhari , J. K. Bismillah , P. Wang (1) , A. Trémeau (2)

1 CS-YORK - Department of Computer Science [York]
2 LHC - Laboratoire Hubert Curien

The improvement of the CIEDE2000 color-difference formula with respect to CIELAB has been experimentally tested using 10 color pairs which were specifically designed with this goal by Dr. D.H. Alman (CIE TC 1-47, chairman). The merit of these two formulas and the inter-observer experimental variability were measured using the Standardized Residual Sum of Squares (STRESS) index. Experiments were performed in two different laboratories, using the 9-steps gray scales for “Color Change” and “Staining” manufactured by the American Association for Testing Chemists and Colorists, and the Society of Dyers and Colourists. Observations were performed under standardized D65 sources by 21 inexperienced observers with non-defective color vision. The results found in both laboratories employing the two 9-steps gray scales were similar, and indicated a clear improvement of CIEDE2000 upon CIELAB, as was expected. The inter-observer variability in our experiments was considerably high, even higher than the predictions made using CIEDE2000. This means that CIEDE2000 (but not CIELAB) predicted our average-observer's results better than individual observers as a group. Current results encourage the use of the CIEDE2000 color-difference formula in industrial and applied colorimetry, including food color research.

Mots clés: Color-Differences measurement

Domaines: Traitement des images [eess.IV]

M. Melgosa, J. Romero, R. Huertas, L. Gómez-Robledo P. A. García, D Khaustova, et al.. Color difference measurements using 9-steps gray scales. AIC 2010 Color and Food, Oct 2010, Mar del Plata, Argentina. pp 108-111. ⟨hal-00520987⟩