Uniform color space based on color matching

Shih Fang Liao, Tsung Hsun Yang, Cheng Chung Lee

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This research intends to explore with a uniform color space based on the CIE 1931 x-y chromatic coordinate system. The goal is to improve the non-uniformity of the CIE 1931 x-y chromaticity diagram such as to approach the human color sensation as possible; however, its simple methodology still can be kept. In spite of the existence of various kinds of the uniform color coordinate systems built up early (CIE u′-v′, CIE Lab, CIE LUV, etc.), the establishment of a genuine uniform color space is actually still an important work both for the basic research in color science and the practical applications of colorimetry, especially for recent growing request in illumination engineering and in display technology. In this study, the MacAdam ellipses and the Munsell color chips are utilized for the comparison with the human color sensation. One specific linear transformation matrix is found for the CIE 1931 color matching functions (x̄(λ), ȳ(λ), z̄(λ) to become the novel uniform ones. With the aid of the optimization method, the transformation matrix can be easily discovered and makes the 25 MacAdam ellipses are similar to each other in the novel uniform color space. On the other hand, the perfectiveness of the equal-hue curves and the equal-chroma contours from the Mnusell color chips evaluates for the best optimization conditions among several different definitions for the similarity of all the MacAdam ellipses. Finally, the color difference between any two colors can be simply measured by the Euclidean distance in the novel uniform color space and is still fitted to the human color sensation.

Original languageEnglish
Title of host publicationSeventh International Conference on Solid State Lighting
StatePublished - 2007
Event7th International Conference on Solid State Lighting - San Diego, CA, United States
Duration: 27 Aug 200729 Aug 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


Conference7th International Conference on Solid State Lighting
Country/TerritoryUnited States
CitySan Diego, CA


  • MacAdam ellipses
  • Munsell color chips
  • Spectral sharpening
  • The CIE 1931 color matching functions
  • Uniform color space


Dive into the research topics of 'Uniform color space based on color matching'. Together they form a unique fingerprint.

Cite this