Long-Term Variability in the Spectral Loci of Unique Blue and Unique Yellow

摘要

To determine differences in color appearance within observers over time, the unique blue and unique yellow loci, points in the spectrum which appear neither reddish nor green, were measured in two observers over a 16-month period. Minor random-appearing fluctuations in color appearance were found for each observer on a day-to-day basis. Over a period of several months, however, substantial shifts were noted. Substantial differences were also noted between the two observers, both with normal color vision. This research indicates that displays with coding by color identification should use colors sufficiently discriminable that no confusion arises due to shifts of color appearance within an observer or to differences among observers, even if color vision is normal. Reprints. (AW)