Together, a and b give the coordinate o fthe colour in the chromaticity chart so that hue and chroma can be calculated accordingly. 和一起构成该色在彩度图内的坐标，从而可计算该色的色相和纯度。收藏
The value of the colour is indicated by the position of the curve and the chroma is the coverage of the curve. 曲线所覆盖范围,表示彩度。收藏
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