CIELab Color Space

A three-dimensional, rectangular coordinate system developed by the Commission Internationale de lEclairage (CIE) . The vertical coordinate L specifies the lightness of a color, the 2 horizontal coordinates a and b represent the hue and the saturation on red/green and blue/yellow axes respectively. The CIELab color space is also ideal for representing color differences, since geometric distances in the color space more or less approximate the intuitive color differences.