Levels of R, G, and B can each range from 0 to 100 percent of full intensity. The total number of available colors is 256 x 256 x 256, or 16,777,216 possible colors. In order to actually display the colors for all possible values, the computer display system must have 24 bits to describe the color in each pixel . In display systems or modes that have fewer bits for displaying colors, an approximation of the specified color will be displayed. In creating Web pages, the number of RGB values that are recommended for use is considerably reduced - first, by the fact that many displays can handle only 256 colors and, secondly, because PC and Mac Web browsers handle 40 of these 256 colors slightly differently.
Web browsers is recommended.