An image processing apparatus includes a corrector and a determinator. The corrector corrects a correspondence between display pixels of a display unit and data pixels on an image signal to be inputted to the display pixels so that at least one of the display pixels is defined as a mask pixel to which the image signal is no longer inputted. The determinator determines a gradation of the mask pixel in accordance with a gradation indicated by the image signal to be inputted to an edge pixel that is included in the display pixels and located at an edge of the display pixels.