1. A method for projecting a display image using a projector to form a projected image on a surface, the method comprising: performing radiometric calibration based on a radiometric model using a camera, wherein the radiometric model takes into account effects of at least one color channel of the projector and the camera upon one or more different color channels of the projector and the camera and wherein the performing the radiometric calibration further comprises computing non-linear responses of the projector and the camera by projecting first images having increasing gray intensity, capturing the projected first images as measured images, and multiplying color values in the measured images by the inverse of a color mixing matrix; compensating the display image to form a compensated display image based on the radiometric calibration; and projecting the compensated display image onto the surface.