the present invention and in a preferred embodiment may in fact be replaced by a suitable auxiliary pixel the auxiliary pixels 106 amp 108 and patterns of them in a preferred embodiment are used to modulate the toner cloud density and distance from the photoreceptor during development these auxiliary pixels 106 amp 108 may be above the frequency for printing on the mtf curve or they may be of sub critical density that is below the normal density threshold for printout in their respective regions so that they are non printing in effect this may be achieved typically in two ways first in a laser based system for example the laser may be modulated in a manner such that the laser intensity is so reduced that the auxiliary pixel location is achieved by substantial under exposure as a result much more charge is retained on the photoreceptor at that location than there would be for a normal fully developed pixel at that location second in the alternative or in combination with laser intensity modulation the pulse width may be modulated to such a high frequency and thereby down to such a small size that no toner or an insufficient amount of toner to survive transfer to a substrate adheres to the photoreceptor sufficient to allow printing a pulse width and position modulator pwpm.