This is a system to improve final xerographic image by providing uniformity in both pre-imaged and imaged photoconductive drums or belts. An ESV is placed after the exposure imaging station so that it can measure the voltage on the photoreceptor (PR) belt or drum obtaining a periodic photoreceptor signature. This signature is communicated to a controller and stored therein. After both pre-imaged and imaged signatures are obtained, the controller compensates for these signatures to all imaging runs thereafter to ensure uniform voltage and thereby uniform final images.