The present invention provides a computer readable medium recording a printer control program for executing in a computer a command generation of generating a command that instructs a printer on operation and a command transmission of converting a command containing a predetermined amount of data into a packet and transmitting the packet command, wherein the computer executes: generating a preprocessing command for actuating a printing mechanism before a coloring agent is attached to a printing medium, and generating a dummy command to be included in a packet so as to obtain the predetermined amount of data, which will be discarded by the printer, and generating one or more packets including the dummy command and the preprocessing command.