I use a colorimeter that returns x,y,Y values. What units do they express?
The x,y,Y values you get from your instrument are chromaticity coordinates (x,y) and luminance (Y). The chromaticity coordinates describe the hue and saturation of the stimulus with no information about the luminance. They are unitless, normalized versions of the XYZ tristimulus values. They are computed as follows: x = X/(X+Y+Z) y = Y/(X+Y+Z). There is no way to compute Y from x an y. The x,y values range from zero to one and are generally reported to 3 or 4 digits beyond the decimal point. You can read more about chromaticity coordinates in almost any introductory text on colorimetry. One good example is Berns’ “Principles of Color Technology, 3rd Ed.”.
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