| http://www.w3.org/ns/prov#value | - Alternatively, from the viewpoint of signal amount compression or the like, the signal representing the original image density Dorg (Dorg=k'???log E where k' is a constant) proportional to a logarithmic value of the aforesaid optical amount E may be used, and the operations may be carried out by use of Dus, ??, Dus.k, ??k, Db1 and Db2 corresponding to said signal.
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