Patent ID: 8693906

Claim:
A method for printing, the method comprising: charging individual engine pixel locations of a primary imaging member with an image modulated difference of potential of a first polarity between a higher difference of potential and a lower difference of potential relative to a ground; establishing a first development difference of potential of the first polarity between the higher difference of potential and the lower difference of potential at a first development station to form a first net development difference of potential between the first development station and the individual engine pixel locations on the primary imaging member, with the first net development potential being the first development difference of potential less any image modulated difference of potential at the individual engine pixel location; positioning a first toner charged at a second polarity that is the opposite of the first polarity at the first development station, such that the first toner is electrostatically urged to deposit in the individual engine pixel locations according to the first net development difference of potential for the individual engine pixel locations; establishing a second development difference of potential of the first polarity at a second development station to form a second net development difference of potential between the second development station and the individual engine pixel locations on the primary imaging member, with the second net development difference of potential being the second development difference of potential less any image modulated difference of potential at the individual engine pixel location and less any difference of potential relative to ground of any first toner at the individual engine pixel location; and positioning a second toner of the second polarity at the second development station such that the second toner is electrostatically urged by the second net development difference of potential to deposit on the individualengine pixel locations having the first toner; wherein the second net development difference of potential is greater than the first development difference of potential to cause the second toner to deposit on the engine pixel locations having the first toner in an amount that increases according to the second net development difference of potential, and wherein the first development difference of potential is at a level that is determined to provide a first range of modulated first toner amounts in response to image modulated differences of potential that are in a first range ending at the first development difference of potential and that provides a second range of modulated second toner amounts in response to image modulated differences of potential that are in a second range beginning at the first development difference of potential.