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three-dimensional quality of color vision

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three-dimensional quality of color vision (In French trivariance visuelle, loi de Grassmann) property of color perception of being able to be described with 3 parameters each: Basic valences PDT, opponent color theory axes red-green/yellow-blue/black-white, primary valences RGB, standard valences XYZ, physical color mixing CMY, intuitive attributes hue, chromaticness, brightness.