Abstract
In everyday life, we are often required to shift our gaze by a large angle by rotating our head to compare colors of objects which are considerably separated from each other. To assess the ability to discriminate colors under such conditions, the repeatability of color matching was studied as a function of stimuli separation. Color matching ellipsoids were obtained in xyY color space with a Burnham type colorimeter at various angular separations from 6 to 120 degrees. The results showed that the ellipsoids enlarged slightly with separation but the change of the ellipsoids was not monotonic. This non-linear change did not suggest that the decrease in performance for color matching was caused primarily by the time interval between successive fixations.
