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The dominant wavelength of a color is the wavelength of the spectrum color whose chromaticity is on the same straight line as the sample point and the illuminant point.


On the CIE color coordinate space, a straight line drawn between the point for a given color and the point for the color of the illuminant can be extrapolated out so that it intersects the perimeter of the space in two points.

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【Lighting Knowledge】Dominant Wavelength (λd)
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