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color measurement/measuring, colorimetry

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color measurement/measuring, colorimetry (In French colorimétrie) process for non-destructive materials testing to determine the spectral properties of a surface (ISO 13655:) or of a light source (DIN 5033-8) or of the color rendering characteristics of a device (ISO 12641/12642); carried out with spectrophotometers or spectrodensitometers which can calculate all colorimetric values on the basis of the spectral luminance factor. Before the beginning of measuring, the measuring device must be calibrated to an absolute white standard, also supplied.