1. A method of calibrating a cathode ray tube comprising: measuring outputs of the cathode ray tube for a subset of device values of the cathode ray tube; choosing one or more adjustable parameter values of a device model for the cathode ray tube such that an average error between expected outputs determined from the device model and measured outputs of the cathode ray tube is on the order of an expected error, wherein a number of the adjustable parameters is less than a number of measured outputs of the imaging device; and adjusting image data according to the device model to achieve a target behavior for the cathode ray tube.