1. A controlling device for causing a print performing unit to perform print, the print performing unit comprising a print head in which a plurality of nozzles for discharging liquid droplets is formed, the controlling device comprising: an image process unit configured to perform an image process on specific image data so as to generate processed image data; and a supplying unit configured to supply the processed image data to the print performing unit, wherein the image process unit comprises a selecting unit configured to select a process mode from a plurality of process modes, the image process unit performs the image process in accordance with the selected process mode, the plurality of process modes includes: a first process mode for performing the image process by performing, in order to compensate variability of discharging amounts of the liquid droplets discharged from, the plurality of nozzles, a specific process on a target pixel within target image data using correction data for a target nozzle, the target nozzle being to form a dot at a position on a print medium corresponding to the target pixel; and a second process mode for performing the image process by performing the specific process on the target pixel within target image data without using the correction data for the target nozzle, the correction data is data acquired using a target set of characteristic data included in a plurality of sets of characteristic data corresponding to the plurality of nozzles, the target set of characteristic data corresponding to the target nozzle, and each set of the characteristic data is data related to a discharging amount of a liquid droplet of a corresponding nozzle.