Abstract: An apparatus in which an original document is reproduced. The original document is scanned to determine the tonal graduations thereof and a signal generated indicative thereof. An image of the original document having a plurality of half-tone dot spacial frequencies is formed. Each half-tone dot spacial frequency is selected from a plurality of selected spacial frequencies corresponding to a pre-determined signal range. In this manner, the selected half-tone dot spacial frequencies are a function of the signal indicating the tone graduations of the original document.BACKGROUND OF THE INVENTIONThis invention relates generally to an electrophotographic printing machine, and more particularly concerns a printing machine arranged to reproduce an original document as a copy having the half-tone dot frequency thereof dependent upon the tonal graduations of the original document.In a typical electrophotographic printing machine, a photoconductive member is charged to a substantially uniform level.