Constant hue loci for unique red, yellow, green, and blue and the loci of four binary balanced hues (e.g., equally reddish and yellowish) were measured at 10, 100, and 1000 Td for two observers. Wavelengths of the unique hues were not invariant from 10 to 1000 Td. In Judd’s modification of the 1931 CIE chromaticity diagram, only the unique yellow loci at 10 and 1000Td plotted as straight lines. The other constant hue loci were curved, and all the constant hue loci changed with retinal illuminance.
© 1987 Optical Society of America
Original Manuscript: September 25, 1985
Manuscript Accepted: December 22, 1986
Published: June 1, 1987
Miyoshi Ayama, Takehiro Nakatsue, and Peter K. Kaiser, "Constant hue loci of unique and binary balanced hues at 10, 100, and 1000 Td," J. Opt. Soc. Am. A 4, 1136-1144 (1987)