An image processing apparatus configured to generate a printing image for printing document data by a printer, includes a first processing part configured to generate first processing data having resolution different from the resolution with respect to printing order for character data contained in the document data; a second processing part configured to generate second processing data having a pixel density consistent with the pixel density of the first processing data for image data contained in the document data; and a printing image generating part configured to generate printing data by synthesizing the first processing data and the second processing data. The second processing part makes the pixel density of the second processing data consistent with the pixel density of the first processing data by tone conversion of the image data.