Color solid

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A color solid is a three-dimensional representation of the color space, an analog of the two-dimensional color wheel. The added spatial dimension allows a color solid to depict an added dimension of color variation. Whereas a two-dimensional color wheel typically depicts the variables of hue (red, green, blue, etc.) and brightness (gradations of light and dark), a color solid adds the variable of saturation, allowing the sphere to depict every conceivable color in an organized three-dimensional structure.

1 Organization
2 Use
3 External links
4 References

[edit] Organization

Different color theorists have each designed unique color solids. Many are in the shape of a true sphere, whereas others are warped three-dimensional ellipsoid figures, these variations being designed to express some aspect of the relationship of the colors more clearly. The color spheres conceived by Phillip Otto Runge and Johannes Itten are typical examples and prototypes for many other color solid schematics. The models of Runge and Itten are basically identical, and form the basis for the description below.

Two views of a color sphere. In the "top view," a portion of the color sphere has been removed, revealing a quarter of the equatorial plane. In the "right view," a part of the sphere has been removed to reveal part of an axial plane. (Note: this color sphere does not exactly represent the color sphere's of Itten and Runge, as the sphere does not have all colors opposite their contrasting color.)

Pure, saturated hues of equal brightness are located around the equator at the periphery of the color sphere. As in the color wheel, contrasting (or complementary) hues are located opposite each other. Moving toward the center of the color sphere on the equatorial plane, colors become less and less saturated, until all colors meet at the central axis as an indistinguishable gray. Moving vertically in the color sphere, colors become lighter (toward the top) and darker (toward the bottom.) At the upper pole, all colors meet in an indistinguishable white; at the bottom pole, all colors meet in an indistinguishable black.

The vertical axis of the color sphere, then, is gray all along its length, varying from black at the bottom to white at the top. All pure (saturated) hues are located on the surface of the sphere, varying from light to dark down the color sphere. All impure (unsaturated hues, created by mixing contrasting colors) comprise the sphere's interior, likewise varying in brightness from top to bottom.

[edit] Use

Artists and art critics find the color solid to be a useful means of organizing the three variables of color (hue, brightness, and saturation) in a single schematic, using it as an aid in the composition and analysis of visual art.