Tristimulus Values

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In a particular color model, the respective amounts of the three additive color primaries (red, green, and blue) that make up a given color. These three values are obtained by measuring a color sample through red, green, and blue filters. The tristimulus values are usually indicated using letters, such as the "LUV" in CIELUV or the "L*a*b*" in CIELAB.