An example hard imaging device includes an interface to access image data corresponding to images to be formed using the hard imaging device. The example hard imaging device further includes processing circuitry in communication with the interface to access the image data, to access correction data corresponding to a geometric distortion of a scan lens of an optical scanning system of the hard imaging device, and to modify the image data according to the correction data to reduce image errors introduced during optical scanning of the image data using the optical scanning system.