Procedure for Optimum Choice of a Small Number of COLORS From a Large COLOR Palette for COLOR Imaging
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
The present procedure selects a small number of colors, to be used for image presentation on a cathode ray tube (CRT) display, from among those available in a very large color palette. The selected colors produce an image having minimum entropy. Minimum image entropy means that the per pel average color error is a minimum. 1. THE COLOR-CUBE MODEL A "color-cube" will be used in explaining the algorithms that, as a whole, comprise the present procedure. Colors in a three-phosphor CRT can be represented as three-component vectors. The magnitude of each of the three components, ranging from zero to one, represents the intensity or saturation of one of the three primary phosphor colors. Each of the three color components can be laid along an edge of a cube radiating and increasing in intensity from a common corner (Fig. 1).