1. A method of swipe-scanning a graphic image pre-printed on a surface, said method comprising the steps of: (i) operatively positioning a swipe-scanner relative to the surface and swiping the scanner across the surface; (ii) capturing, during said swipe, successive images of portions of the graphic image; (iii) printing, during said swipe, successive parts of a position-coding pattern onto said graphic image, said position-coding pattern identifying a plurality of absolute positions and an impression identity for the graphic image; (iv) sensing, during said swipe, positions of said scanner; (v) using the sensed positions to control, during said swipe, printing of the position-coding pattern; (vi) using the sensed positions to assemble said captured portions of said graphic image into a scanned graphic image; and (vii) generating association data indicating an association between the impression identity, the plurality of absolute positions and the scanned graphic image.