The present invention is to provide an image processing device and an image processing method which can perform correction so as to suppress variation in color in consideration of color rendering properties of a light source when preparing data for image formation. In an image processing device according to one embodiment of the present invention, an output density correction value selection unit determines an output density correction value of CMY inks with hue of Gy ink, being an achromatic color material of high light source dependence as a reference. Based on the determined output density correction value, the balance of the CMY inks is corrected.