Disclosed is a computer readable storage medium storing a program to make a computer realize functions of an image storage unit to store image data for generating a tint block image, a tint block image generation unit to generate the tint block image based on the image data, a script generation unit to generate a script for forming the tint block image based on the tint block image generated by the generation unit, a script adding unit to add the script to print data and a print data input unit to input the print data in which the script is added by the adding unit to an image forming apparatus.