Hue, Lightness, Saturation (HLS) Color Model

  In the HLS Color Model, you specify a color by three
  characteristics:  hue, lightness, and saturation.

  *   Hue is color.

  *   Lightness is color intensity; that is, the amount of the
      color.

  *   Saturation is the purity of the color, or how much the
      color is diluted by white.

  The HLS Color Model contains three scales that represent
  the ranges of hue, lightness, and saturation.

  Additional topics:

  *   Color Models