17. The non-transitory computer-usable data carrier of claim 15 , wherein the first or second fixed reference stimulus comprises a 50% binary halftone pattern alternating between white and black stimuli.
15. A non-transitory computer-usable data carrier storing instructions that, when executed by a computer, cause the computer to: present on a color display device a color stimulus; receive from a user one or more natural language commands to adjust the color stimulus until it appears to visually match a fixed reference stimulus in color and luminance, wherein an adjusted color stimulus comprises a set of digital values and the natural language commands for adjusting the color stimulus comprise at least a command to match the color stimulus to the fixed referenced stimulus, a direction in which the adjustment takes place, and a magnitude of change along the direction; use the digital values of the adjusted color stimulus to derive at least one calibration tone response curve (TRC) for the color display device; present on the color display device a second color stimulus; receive from the user one or more natural language commands to adjust the second color stimulus until it appears to visually match a second fixed reference stimulus in color and luminance, wherein the second adjusted color stimulus comprises a set of digital values and the natural language commands for adjusting the color stimulus comprise at least a command to match the second color stimulus to the second fixed referenced stimulus, a direction in which the adjustment takes place, and a magnitude of change along the direction; use the digital values of the second adjusted color stimulus to refine the at least one TRC for the color display device; and apply the calibration function to produce corrected colors on the display device.