Patent ID: 7456995

Claim:
A method for printing an image on a print medium, comprising: positioning a front side of the print medium within a print zone to allow printing on a front side image on the front side of the print medium; scanning a carriage containing one or more inkjet print heads while detecting at least one edge of the print medium using a sensor located over the print medium; calculating print medium and placement characteristics based upon the detecting the at least one edge of the print medium to determine calculated print medium and placement characteristics for the print medium; passing the print medium through a duplexing path that flips the print medium and presents a back side of the print medium in the print zone for printing a back side image; utilizing the placement characteristics to shift the back side image to align with the front side image, wherein shifting the back side image includes digitally shifting the back side image in a direction aligned with or transverse to a medium advance axis after the print medium is flipped and when the print medium is non-square and wherein the shifting the back side image includes digitally rotating the back side image after the print medium is flipped and when the print medium is non-parallel; and printing the image on the medium.