Measuring the Uncertainty of Colour Matching

This study investigated various uncertainties in colour matching, including matching stimulus and measuring instruments (such as random fluctuation, drift over time, spatial uniformity, temperature), calibration (photometric, wavelength and additivity) and observer (intraand inter agreements). From the research results, it was found that the observer error was the major source of errors in colour matching, which was about 10 times of instrumental uncertainties. While among the instrumental uncertainties, the major source of error was spatial non-uniformity of beams and filters. The occurrence of uncertainties could influence the derivation of colour matching functions. Another task for the project was to reduce uncertainties in colour matching as much as possible. The uncertainties of instruments could be reduced to a minimum by adjusting the equipment and choosing better methods of measurement. It was found the uncertainty of observers could be further reduced by choosing a better way of arranging experiments.