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Definition:

Excitation purity is the distance from illuminant point to reference point, divided by that from illuminant point to spectrum locus. The ratio used as a guide of the wavelength of spectrum color needed to be mixed with a reference color to give the specified color.

Explain:

put 01Scale of saturation (0% at left side and it is black and white).

Actuality Application:

put 02Original image, with relatively muted colors

put 03Increased 80%

put 04Decreased 80%

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【Lighting Knowledge】Excitation Purity
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