1. An apparatus for processing an image, comprising: a determiner configured to determine an area corresponding to a white-saturation area comprised in a raw image based on raw data representing the raw image, wherein the raw image is obtained by photographing and is not processed; and a converter configured to selectively perform an image space frequency distribution conversion on a portion of the raw data that corresponds to the determined area corresponding to the white-saturation area, wherein the converter is further configured to reduce luminance changes of pixels which are not a preset reference pixel in the area corresponding to the white-saturation area, wherein the determiner is further configured to determine the area corresponding to the white-saturation area according to a result of a comparison between a pixel value of the preset reference pixel and a predetermined threshold value and a result of a comparison between a value, which is obtained by multiplying pixel values of pixels that are not the preset reference pixel by white balance coefficients that respectively correspond to the pixels that are not the preset reference pixel, and the predetermined threshold value.