| http://www.w3.org/ns/prov#value | - A method of processing the gradation of a radiation image as defined in claim 1 wherein said density curve satisfies the conditions of Df≦f(Smin)≦Df+0.3, 1.5≦f(Smax)≦2.8, and f(Sp)<f0 (Sp) where Smin and Smax are the minimum and maximum levels of the electric signal and Sp is a predetermined level of the electric signal between Smin and Smax (Smin<Sp<Smax), f(Smin), f(Sm
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