An image processing device including: a luminance obtaining unit that obtains the luminance values of pixels in a region of interest that is at least part of an input image; and a luminance correcting unit that corrects the luminance values of the pixels on the basis of the luminance values obtained by the luminance obtaining unit, such that the distribution range of the luminance values of the pixels in the region of interest is narrowed while maintaining the magnitude relationship between the luminance values in the image.