…Both have their own advantages, with filter-type being compact and lightweight, and spectral-type being superior in terms of precision measurement. Once X , Y , and Z are known, it is possible to convert to u ' v ' uniform chromaticity coordinates, or to convert uniform color space (a three-dimensional space for expressing lightness and perceived chromaticity, in which the distance between two points representing two color stimuli corresponds to the perceived color difference between the two color stimuli) to L * , u * , v * (L * u * v * color system) or L * , a * , b * (L * a * b * color system) by calculation, so many colorimeters have these functions as well ( L * is the lightness index, and u * , v * , a * , b * are called perceived chromaticity indices, and the calculation formula differs for each color system). Colorimeters that measure the colors of two lights and calculate the color difference using the formula are also becoming common. … *Some of the terminology that refers to "uniform color space" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…どちらもそれぞれ特長があり,フィルター式のものは小型軽量化の点で優れ,分光式のものは精密測定の点で秀でている。 X,Y,Zが求まれば,u′v′均等色度座標への変換,あるいは均等色空間(明度と知覚色度を表すための三次元空間で,二つの色刺激を表す2点間の距離が,二つの色刺激の間で知覚される色の差に対応しているもの)のL*,u*,v*(L*u*v*表色系),またはL*,a*,b*(L*a*b*表色系)への変換も計算によってできるので,多くの測色計はそれらの機能も備えている(L*は明度指数,u*,v*,a*,b*は知覚色度指数と呼ばれ,それぞれの表色系で計算式が異なる)。また二つの光の色を測色して,色差を,の式で計算する測色計も一般的なものとなりつつある。… ※「均等色空間」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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