Print control apparatus for performing preprocessing of image data

In response to a print instruction of a specified print object image, the print control apparatus of the invention corrects print object image data representing the specified print object image with a preset correction parameter set for improving picture quality of the specified print object image and prints the specified print object image according to corrected print object image data. A print object image specification module of the print control apparatus specifies the print object image as a printing object. A preprocessing execution module of the print control apparatus performs predetermined preprocessing of the print object image data representing the specified print object image to set the correction parameter used for correcting the specified print object image. In response to specification of the print object image by the print object image specification module, a preprocessing management module of the print control apparatus instructs the preprocessing execution module to implement advanced preprocessing of the print object image data representing the specified print object image, prior to the print instruction. This arrangement of the invention desirably shortens a time period elapsed before start of required image processing for printing the specified print object image.