Monday, December 7, 2009

Tristimulus values

Tristimulus values: The amounts of a set of primaries, used to specify color matches.

Billmeyer and Saltzman's Principles of Color Technology, 3rd Edition

인간의 눈은 cone cells라 불리우는 photoreceptors를 가지고 있다. Photoreceptors들은 중간 단계, 그리고 상위 단계의 밝기의 color를 인식하고, sensitivity peak들은 short(420-440 nm), middle (M, 530-540 nm), 그리고 long (L, 560-580 nm) wavelengths이다. 물론 rod cell이라 불리우는 하위 단계의 밝기의 monochromatic night-vision receptor도 있으며, 이것은 peak sensitivity는 490-495 nm의 파장을 가진다. 원칙적으로 이 세개의 parameter들은 color sensation을 서술한다. Tristimulus values는 3원색의 량들을 의미하며, test color match하기 위해 필요한 3 component additive color model안의 3원색을 이야기한다. Tristimulus values는 CIE 1931 color space에서 주어지며, 여기서 그들은 X, Y, Z로 표시된다.

각 color에 대해 tristimulus value를 연결하는 어떤 방법은 color space라 불리운다. CIE XYZ는 가장 많이 쓰이는 표준으로 많은 다른 color들이 정의되기 위한 basis로 사용된다.

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