An image processing apparatus for outputting to a display unit an output image, includes a conversion unit configured to convert a gradation value of a first pixel, of an input image, the first pixel corresponding to luminance higher than a maximum value of luminance at which the display unit can display into a predetermined gradation value, to convert a gradation value of a second pixel of the input image, the second pixel corresponding to luminance less than or equal to the maximum value of the luminance at which the display unit can display, into a gradation value less than or equal to the predetermined gradation value, and to generate the output image that includes both the first pixel with converted gradation value and the second pixel with converted gradation value; and an output unit configured to output the output image to the display unit.