Certain examples provide photometric or radiometric calibration using optical feedback. A disclosed example includes dithering between a first display pixel value and a second display pixel value to create a light source from a display. The disclosed example includes capturing the light source using a camera via a plurality of photographs taken by the camera. Each photograph includes a plurality of camera pixels. The disclosed example includes determining a camera response by measuring plurality of camera quantization levels associated with the plurality of camera pixels based on the first display pixel value and the second display pixel value. The disclosed example also includes determining a display response based on the plurality of camera quantization levels. The display response includes a plurality of luminance output values of the display.