False color

Japanese: 虚色 - きょしょく
False color

…When it comes to what colors X, Y, and Z are, we can roughly think of X as red, Y as green, and Z as blue. If the X value is large, the color C (C) is a reddish color, and if the Y value is large, the color is greenish. To be precise, however, X, Y, and Z are non-existent colors, that is, imaginary colors in color theory, and are colors chosen arbitrarily in an abstract color space. In particular, the primary stimuli for X and Z are colors that have no brightness, and cannot be defined unless they are imaginary colors. …

*Some of the terminology explanations that mention "virtual color" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…X,Y,Zがどういう色かというと,おおよそXは赤,Yは緑,Zは青と考えてよく,X値が大きいとC(C)という色は赤みの強い色,Y値が大きいと緑みの色などの推測ができる。ただし正確にはXもYもZも実在しない色,つまり色彩学でいう虚色を採用しており,抽象的な色空間の中で適当に選んだ色である。とくにXとZの原刺激は明るさをもたない色であって,虚色でないと定義できない色である。…

※「虚色」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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