Correlation between visual and colorimetric scales ranging from threshold to large color difference

Haisong Xu, Hirohisa Yaguchi, Satoshi Shioiri

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Psychophysical experiments of color discrimination threshold and suprathreshold color-difference comparison were carried out with CRT-generated stimuli using the interleaved staircase and constant stimuli methods, respectively. The experimental results ranged from small (including threshold) to large color difference at the five CIE color centers, which were satisfactorily described by chromaticity ellipses as equal color-difference contours in the CIELAB space. The comparisons of visual and colorimetric scales in CIELAB unit and threshold unit indicated that the colorimetric magnitudes typically were linear with the visual ones, though with different proportions in individual directions or color centers. In addition, color difference was generally underestimated by the Euclidean distance in the CIELAB space, whereas colorimetric magnitude was perceptually underestimated for threshold unit, implying the present color system is not a really linear uniform space. Furthermore, visual data were used to test the CIELAB-based color-difference formulas. In their original forms CIEDE2000 performed a little better than CMC, followed by CIELAB, and with CIE94 showing the worst performance for the combined data set under the viewing condition in this study.

Original languageEnglish
Pages (from-to)349-359
Number of pages11
JournalColor Research and Application
Issue number5
Publication statusPublished - 2002 Oct


  • Color difference
  • Color discrimination threshold
  • Color-difference comparison
  • Color-difference formula
  • Equal color-difference contour
  • Method of constant stimuli
  • Method of staircase


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