We propose a systematical color image coding which will be very important in near future image communication via ISDN. The systematic color image coding is systematically designed and coded based on the Picture Quality Scale(PQS). PQS is defined as a function of the color difference which is expected to be defined as an Euclid distance of signal error between the original image signal and the decoded signal. we should start the following detailed discussions. (a) the uniformity of HVC color scale. (b) the mathematical two-way transformation between (R.G.B) color space and (H.V.C) color space. For an example, the step of develpment of VQ codings is considered : (1) codings of 3-dimensional VQ of Value(V). Chroma(C) and Hue(H). (2) higher dimensional VQ coding considering not only the color signal H.V.C at a concerned pixel but the correlation with the adjoining image signals, and (3) segmentation codings combined with the coding (1). Authors strongly desire that the international friendship should be maintained during the course or the development.

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