1. An image processing device for generating vector data from print data to spool the vector data, the image processing device comprising: a computer-readable memory constructed to store computer-executable process steps; and a processor constructed to execute the computer-executable process steps stored in the memory; wherein the process steps stored in the memory cause the processor to: receive the print data; decide whether a process for the received print data relates to a printing process or a spooling process; set an at-spooling resolution; determine a processing resolution as i) an output resolution of the image processing device, when the printing process is decided, ii) the at-spooling resolution, when the spooling process is decided and a value of the at-spooling resolution is set, and iii) an output resolution of a device having a maximum resolution in a network to which the image processing device is connected, when the spooling process is decided and a value of the at-spooling resolution is not set; and convert the print data to the vector data based on the determined processing resolution.