Abstract: The output of a conventional laser printer having a resolution of 300.times.300 dots per inch (DPI), and a predetermined threshold level for forming image dots, is enhanced by selectively providing interleaved image dots between the normal scan lines of the laser printer. Such interleaved image dots between scan lines may be achieved by appropriately energizing the two pixels directly above and directly below that desired interleaved dot, with the energizations at one or both pixels being selectively below the threshold level for producing a dot on the scan line, but with the combined energization at the desired interleaved point being above the threshold level to produce the desired interleaved dot. An input 600.times.

Abstract: A conventional display device, such as a marking engine for a laser printer or digital copier, having a nominal resolution (where the energy source for the display device can be selectively activated) and a predetermined threshold level for producing output image dots, is modified to a different (higher or lower) resolution or modified to produce output dots along axes different from the axes of the display device (such as for producing halftone screens on angles), by selectively activating the energy source to produce overlap areas that exceed the device threshold and thereby produce dots at positions that are not on the normal resolution positions of the device.