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Reference.org
Colorimetry
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<p> Colorimetry is "the science and technology used to quantify and describe physically the human <a href="/facts/Color_perception/j3ou3Izz">color perception</a>". It is similar to <a href="/facts/Spectrophotometry/hhjdQYvf">spectrophotometry</a>, but is distinguished by its interest in reducing spectra to the physical correlates of color perception, most often the <a href="/facts/CIE_1931_color_space/fzgwzV8V">CIE 1931 XYZ color space tristimulus values</a> and related quantities. </p>