An image processing apparatus includes an adjustment data setting unit which sets base adjustment data used to readjust a density of a part having a lower density than a predetermined density of image data to a lower value with respect to a printer driver which generates print data, a data input unit which receives the image data and the base adjustment data from the print driver, and a base adjustment unit which executes base adjustment in a predetermined part of the image data in accordance with the base adjustment data. The base adjustment data includes information designating a data attribute of the predetermined part where base adjustment is carried out, and information designating a level of the base adjustment.