The three letters H, L and S represent the classic colour variables of hue, luminance and saturation. Regardless of such identification, the
Date: No exact date; the system was developed in conjunction with television technology.
Basic colours: Red, green and blue
Form: Double cone
Application: Colour-order for phosphorescent television screens
Bibliography: «Computer Graphics CAD/CAM Image Processing», Editrice il Rostro, Milan, 1981; David Travis, «Effective Color Displays», Computer and People Series, Academic Press, London 1991.