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From Visual Stimuli to Color Space

In order to construct a mapping , rather than just define it extensionally as I did in Section (p. ), we need a theory of how to transform a function into one or more pairs . Recall that represents the spectral energy distribution of a stimulus, as a function of wavelength; represents the set of all such distributions; represents a set of color terms; represents the closed interval ; and represents a mapping , i.e., a color-naming mapping. I will conceptualize the mapping as being a composition of two mappings: one that takes us from to what I will refer to as a color space, and one that takes us from that color space to . This chapter discusses the first one of those mappings.

• General
• Assumptions and Limitations
• Modeling Neurophysiological Data
  • Reconstruction of 3D response functions
  • Saturation levels revisited
  • Reducing six dimensions to three
  • The sigmoid-of-linear activation model
  • Normalization of the basis functions
• Visualizing Color Space Properties
• Some Interesting Properties of the NPP Space
• Psycho-Physical Variables
• Learning a Color Space Transformation