Chromaticity Diagram Showing Cone Excitation by Stimuli of Equal Luminance

J Opt Soc Am. 1979 Aug;69(8):1183-6. doi: 10.1364/josa.69.001183.


In a space where Cartesian coordinates represent the excitations of the three cone types involved in color vision, a plane of constant luminance provides a chromaticity diagram in which excitation of each cone type (at constant luminance) is represented by a linear scale (horizontal or vertical), and in which the center-of-gravity rule applies with weights proportional to luminance.

MeSH terms

  • Color Perception / physiology*
  • Humans
  • Light*
  • Mathematics
  • Models, Biological*
  • Photic Stimulation
  • Photoreceptor Cells / physiology*