Introduction
Human color perception is normally compatible with the classic opponent color
theory of Hering (1872), which describes chromaticity in two dimensions formed
by pairs of primary hues: red–green and blue–yellow. All other hues are perceived
as mixtures of two primary dimensions. Opponent mixtures do not create chromatic
combinations, as they fall inside the two-dimensional continuum of Newton’s color
circle. In an opponent color space, transitioning from a green color to red results
in seeing mixtures of green and yellow followed by seeing mixtures of yellow and