Abstract: Most of the color image processing terminals and workstations available today do not support full color quality, and they describe colors, in an ordinary way, by red, green and blue signals. The colors are unable to be reproduced exactly due to limitations imposed by the analog-to-digital conversion. In this paper we investigate the reproduction errors caused by quantization in a space where the coordinates represent the excitation of the three attributes involved in color vision. Further, a procedure to limit the color quantizing error under the condition of 'just noticeable difference or very little difference in visual perception' is proposed. It is found that to acquire a high quality color representation which can express the subtle color variety, the quantizing accuracy is required more than 42 bits per set of (R,G,B) signals.!5
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