Methods, media, and systems for assessing the quality of a digital image. A complication-free exchanging of the ink printing module that functions with a low technical outlay, and without contamination and mechanical impairment of the counter-contacts for the ink printing module, by the use of counter-contacts, to a contact field and to a module chip of ink printing module that are adjustably situated in the receptacle by means of a bar. In active position, the lever is released from the mobile armature and a spring presses the mobile contact on the fixed contacts.