opponent color theory

opponent color theory (In French théorie des couleurs opposées) theory of color signal processing in the brain, established in 1905 by E. Hering and attributed in 1927 by R. Luther to the basic stimuli PDT (today LMS). According to this theory, the spectral value function signals obtained from the cone types generating green (P, M), red (D,L) and blue (T, S) are further processed neither in their original form nor as RGB signals, but are “coded” in an opponent color process which in turn is threedimensional: red-green, yellow-blue and dark-light, see also elementary colors, CIELAB.