Ayama M, Nakatsue T, Kaiser P K
J Opt Soc Am A. 1987 Jun;4(6):1136-44. doi: 10.1364/josaa.4.001136.
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 1000 Td plotted as straight lines. The other constant hue loci were curved, and all the constant hue loci changed with retinal illuminance.
针对两位观察者,在10、100和1000尼特的亮度下测量了独特红、黄、绿、蓝的恒定色调 loci 以及四种二元平衡色调(例如,同样偏红和偏黄)的 loci。独特色调的波长在10至1000尼特之间并非恒定不变。在1931年CIE色度图的贾德修正版中,只有10和1000尼特下的独特黄色 loci 绘制成直线。其他恒定色调 loci 是弯曲的,并且所有恒定色调 loci 都随视网膜照度而变化。