Chromatic adaptation and π mechanisms

Jan Walraven, John S Werner

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Adaptive hue shifts of the achromatic point were measured in conditions in which a test field was presented as a flashed increment on steady chromatic backgrounds. The variables investigated were background chromaticity, luminance, and stimulus contrast. The results could be accounted for quantitatively by a mechanistic model with the following properties: discounting of the (steady) background, or ac‐coupled signal processing; cone spectral sensitivities as estimated by Vos and Walraven; and receptor‐specific gain controls that have the same action spectra and gain characteristics as Stiles' π5, π4, and (modified) π1 mechanisms.

Original languageEnglish (US)
Pages (from-to)50-52
Number of pages3
JournalColor Research and Application
Issue number1
StatePublished - 1982
Externally publishedYes

ASJC Scopus subject areas

  • Human Factors and Ergonomics
  • Chemistry(all)
  • Chemical Engineering(all)


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