Measurements of the edge characteristics of a xerographic printer are presented. Obtained using a high resolution drum scanner, these data are analyzed with the goal of quantifying edge nonlinearities. Based on these measurements, a simple model is constructed to describe the change in printed toner density for a thin border region surrounded by two larger patches. The model is subsequently used to develop a real time correction algorithm that utilizes the edge nonlinearity measurements, using a fixed point iterative approach. These corrections are shown to be significant, and strongly dependent on the levels of the surrounding patches. Furthermore, it is shown that for larger border widths, the correction is much smaller. This behavior is physically reasonable, as the correction should approach zero as the border region becomes large.