In a web-based imaging environment, a user selects the duplex printing option and elects to print. The magnetic coupling between free and pinned layers in NiMn top spin valve heads is precisely controlled by employing the surface oxidation of Cu seed layer orand Cu spacer layer that improve both the interfacial quality and the crystalline texture. In the process, the coating is preferably carried out in such a manner that a particle size of particles in a sol as a raw material increases by a factor of 1. 60 mm2 per aperture and an aperture ratio of from 10 to 19%, and the aperture shape is an aperture shape not having an angledly bent corner. The system includes the dynamic computation of a camera parameter-dependent factor and applying that factor in real-time to the sampled signal resulting from the scan of the item.