In general

histogram equalization and histogram specification are regarded as two different histogram modification techniques in image enhancement because the latter is generally dependent on the former in the traditional method. In this paper

a new method for histogram modification is reported

in which histogram equalization is regarded as a special case of histogram specification

so it can be applied to either histogram equalization or histogram specification. And in the case of histogram specification

the result of the new method is better than that of the traditional method.