This paper presents experimentally based rules and methods for the
creation of harmonic color sets. First, dichromatic rules are presented
which concern the harmony relationships of two hues. For an arbitrarily
given hue pair, we dene the just harmonic saturation values, resulting
in minimally harmonic color pairs. These values express the fuzzy
border between harmony and disharmony regions using a single scalar.
Second, the value of harmony is dened corresponding to the contrast
of 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 investigations
form a basis for a unied, coherent dichromatic harmony formula as
well as for analysis of polychromatic color harmony. Introduced color
harmony rules are based on Coloroid, which is one of the 5..6 main
color-order systems and furthermore it is an aesthetically uniform
continuous color space. Coloroid has simple closed forward and backward
transformation formulas with the color space of CIE XYZ. It relies
on a huge number of observations and experiments, and it is a very
suitable tool of color dynamics for describing aesthetical relationships.
It has been used in numerous architectural projects. The experimental
data that may be retrieved from them are only partly processed and
published so far. Our article utilizes a 'slice' of this database,
together with additional complementary observations. This paper is
the rst of a planned series of articles, dealing with rules and
coherences of color harmony based on the Coloroid system.
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