1. An x-ray system, comprising: an x-ray source and detector producing x-ray data having a grayscale distribution over an x-ray data range associated with a region of interest, said x-ray data comprising anatomic data indicative of an anatomic structure of a patient in the region of interest and comprising non-anatomic data indicative of structures in the region of interest foreign to the patient, said anatomic and non-anatomic data having grayscale values with at least partially non-overlapping grayscale distributions; an input identifying a reject level along said grayscale distribution of said x-ray data; a processor module automatically calculating a transfer function operative to convert the x-ray data to display values forming an x-ray image, said processor module selecting a minimum value for said transfer function based at least in part on said reject level; and a display displaying said x-ray image based on said display values.