For instance, a particular red may be more accurately called orange-red. Different color systems use different codes to describe colors made up of letters, numbers, or a combination of the two. Value refers to the degree of lightness or darkness in any color. A color of known hue can be more Accurately described by calling it either light or dark. For instance, a red is said to be light red if it is lighter than our notion of a standard red.
Chroma indicates the intensity or purity of a color.
Colors with strong chroma are the most brilliant, most vivid colors that can be obtained. Principles of Color Design. Van Nostrand Reinhold. Hue Gradations with Maintenance of Chroma . In order to maintain strong chroma throughout the transitions, the two hues are not mixed directly, but each is mixed with an adjacent hue gradually approaching the other on the color circle.