The neutral colors of black, white and grays are not part of these colors and are referred to as achromatic colors. Hue, Value and Chroma. Hue is the dimension of color that is referred to as a scale of perceptions ranging from red through yellow, green, and blue, and circularly back to red. Hue can be more precisely described by the colors actual relative position from one hue to the next. For example, a certain blue may be more accurately identified as blue-violet.
Value refers to the degree of lightness or darkness in a color.
For example, a blue is said to be light blue if it is lighter than a standard blue. Chroma corresponds to the intensity or purity of a color. The most brilliant and vivid colors have a strong chroma. Colors that have a large amount of gray are dull and have a weak chroma. To manipulate the color value and maintain maximum chroma, a hue must be of considerable brilliance.