1. A computer-implemented method for color calibration of a color display device, the method comprising: presenting on the display device a color stimulus; receiving from a user one or more natural language commands to adjust the color stimulus until it appears to visually match a fixed reference stimulus, wherein an adjusted color stimulus comprises a set of digital values; using the digital values of the adjusted color stimulus to derive a calibration function for the display device; and applying the calibration function to produce corrected colors on the display device.