Computational Color Harmony based on Coloroid System

Abstract

This paper presents experimentally based rules and methods for thecreation of harmonic color sets. First, dichromatic rules are presentedwhich concern the harmony relationships of two hues. For an arbitrarilygiven hue pair, we dene the just harmonic saturation values, resultingin minimally harmonic color pairs. These values express the fuzzyborder between harmony and disharmony regions using a single scalar.Second, the value of harmony is dened corresponding to the contrastof lightness, i.e. the difference of perceptual lightness values.Third, we formulate the harmony value of the saturation contrast,depending on hue and lightness. The results of these investigationsform a basis for a unied, coherent dichromatic harmony formula aswell as for analysis of polychromatic color harmony. Introduced colorharmony rules are based on Coloroid, which is one of the 5..6 maincolor-order systems and furthermore it is an aesthetically uniformcontinuous color space. Coloroid has simple closed forward and backwardtransformation formulas with the color space of CIE XYZ. It relieson a huge number of observations and experiments, and it is a verysuitable tool of color dynamics for describing aesthetical relationships.It has been used in numerous architectural projects. The experimentaldata that may be retrieved from them are only partly processed andpublished so far. Our article utilizes a 'slice' of this database,together with additional complementary observations. This paper isthe rst of a planned series of articles, dealing with rules andcoherences of color harmony based on the Coloroid system.