純紫軌跡上に目盛られた補色主波長の色度座標

概要

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One of the numerical color specification is represented in the CIE system by the dominant wavelength (DWL) and excitation purity respectively. The DWL usually is found at the intersection of the spectrum locus with a straight line drawn from illuminant point through the given color point. However, in the case of purples, a line drawn in this manner does not intersect the spectrum locus. The DWL is found at the intersection of the spectrum locus with a straight line drawn from the given color point through the illuminant point and extended, which is specified as a complementary wavelength (CDWL). lf the points defining the CDWL are prepared on the purple boundary in advance, it will be not necessary to extend a line from the illuminant point to the spectum locus. For that, authers obtained eight kinds of the numerical tables representing the trichromatic coefficients of the CDWL for ilhiminant A, B, C and D_<65> according to the CIE 1931 standard colorimetric system and the CIE 1964 supplementary standard colorimetric system.