The computation of tristimulus values is a basic step for obtaining various colorimetric quantities.
三刺激值计算是求取各种色度量的基础。
Since this CIE1931 RGB system results negative tristimulus values in calculation, the CIE1931 XYZ standard colorimetric observer was brought forth.
但是，CIE1931 RGB系统在计算颜色的三刺激值时会出现负值，由此产生了CIE1931 XYZ标准色度系统。
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