1. A method of correcting for nonuniformity in imaging of a scintillation camera, the camera having means for producing, in response to radiation events, radiation count signals indicating the location and energy level of associated radiation events, and means for defining an energy range for discarding counts representing events having an intensity outside the defined energy range, and means for producing a display representing radiation events in response to undiscarded radiation counts, said method comprising the steps of: (a) adjusting in real time the range defining means for adjusting the defined energy range relative to the energy level indications in response to the occurrance of each count as a function of the location of the count, and (b) adjusting the response of the camera as a function of location to uniform radiation within its field of view to compensate for regional variations in the sensitivity of the camera within the field.