Section 6 | Page 3

The three dimensions of color:

HUE: The basic color group (red, orange, yellow, etc.) or location on the color wheel

CHROMA: Saturation, or intensity

LIGHTNESS: Lightness or darkness

Hue refers to the name of the color and identifies its position on the color wheel. In three-dimensional color space, all the hues are oriented around the center axis.  The farther from the center, the more saturated the color, or greater the chroma. The center axis represents lightness, with white at the top and black at the bottom. Value is another term often used for lightness/darkness. Most hues have the greatest possiblez chroma, or saturation, at the midpoint of the lightness axis.

 

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 At each end of the lightness axis all hues become less saturated, or have less chroma, which means three-dimensional color space is more spherical than cylindrical

See Figure

Picture