A printing system which prints an image with a print head having a plurality of nozzles capable of forming a dot includes a section acquiring first image data including pixel data constituting the image, which shows a pixel density value of M (M≧3), a section storing nozzle information of each nozzle, a section determining whether to use the nozzle corresponding to each pixel data, a section modifying the density value of the pixel data set as non-use to a lower density, a section increment-correcting the modification-prior density value, a section distributing the increment-corrected density value to the density value of a predetermined pixel adjacent the pixel of the increment-corrected pixel data, a section generating print data to prescribe dot formation information of the nozzles corresponding to the image data after the distribution of the density value, and a section printing the image based on the print data.