Estimation of color-difference formulae at color discrimination threshold using CRT-generated stimuli

Haisong Xu, Hirohisa Yaguchi, Satoshi Shioiri

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The advanced color-difference formulae, CMC, CIE94, and the recently proposed CIEDE2000 formula, together with the basic CIELAB system, were estimated using the chromaticity discrimination threshold data at CIE Gray and Blue color centers. Gray is the most basic color and blue is, perceptually, in the most different region from other areas across the color space. The test stimuli, evenly distributed in the (a*, b*)-, (a*, L*)-, and (b*, L*)-plane of the CIELAB space, were generated on a CRT display, driven by a VSG system. Each direction from each color center was assessed 3 times by a panel of 9 normal color-vision observers with the psychophysical method of interleaved staircase. The experimental data were reliable and consistent with other studies according to the observer accuracy and fitted ellipse parameters. A comprehensive analysis shows the color discrimination tolerances could be well fitted by ellipses, and the CIEDE2000 and CIELAB formulae performed better than CIE94 while the CMC worst at the threshold level for the color centers studied.

Original languageEnglish
Pages (from-to)142-147
Number of pages6
JournalOptical Review
Issue number2
Publication statusPublished - 2001


  • Chromaticity discrimination ellipse
  • CIELAB color space
  • Color difference
  • Color discrimination threshold
  • Color-difference formula
  • CRT
  • Method of staircase


Dive into the research topics of 'Estimation of color-difference formulae at color discrimination threshold using CRT-generated stimuli'. Together they form a unique fingerprint.

Cite this