| http://www.w3.org/ns/prov#value | - efficient equal to ##EQU2## RL is said preset value of low standard density, RH is said preset value of high standard density, R1 is said measured value of low standard density, R2 is said measured value of high standard density, K is a constant, and RD is said measured value prior to correction; and displaying the measured optical density thus corrected. 2.
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