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Luther’s demand

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Luther’s demand (In French condition de Luther) demand to be met by the spectral characteristics of the overall system, formulated in 1927 by the color film pioneer Robert Luther, applied today to colorimetric measuring instruments/color densitometer. The components measured light source (spectral radiation characteristics), measuring filter (spectral transmission characteristics) and photorecipient (relative spectral sensitivity distribution) must match each other in such a way that when they interact, they allow the desired spectral evaluation, without the individual components having to meet certain requirements.