A print controller controls a printing unit to print an image on a recording medium by using a black ink and M chromatic color inks. The print controller stores a part of image data having a plurality of sets of pixel data and determines whether one pixel data set is subject pixel data to be subjected to bleed suppression and includes: setting the one pixel data set as target pixel data; setting, as peripheral pixel data, pixel data set corresponding to a pixel located within a prescribed range from a target pixel; acquiring the N color value set of the target pixel data; acquiring the N color value set of the peripheral pixel data; and determining whether the target pixel data is the subject pixel data based on the N color value sets.