1. A method of image enhancement, the method comprising: acquiring, by a display apparatus, color information from a color region of an image converted from an original image; and changing, by the display apparatus, a brightness of the original image wherein the changing the brightness comprises changing the brightness of the original image based on a brightness compression rate, the brightness compression rate being a rate between a color value from a color distribution based on the color information and a displayable color value of the display apparatus.