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now let us learn the logarithmic transformation of image the formula for logarithmic transformation is s is equal to small s is equal to C log of small R plus 1 where in the small R represents the pixel intensity of input image and the smallest represents pixel intensity of output image this C is constant generally the value of this C is equal to one so if we assume C is equal to one then formula becomes s is equal to log of R plus one if we plot this formula on the graph we get something like this let x-axis represent small R that is pixel intensity of input image and y-axis represents small s that is pixel intensity of output image the pixel intensity of input image varies from 0 to 255 and output image also it varies from 0 to 255 wherein the zero represents perfect black and 255 represents perfect white somewhere here there will be 120 say when an output image also zero represents perfect black and 255 represents perfect white if we plot this s is equals to log of R plus 1 on the