An introduction to the study of colour vision (1915)
Parsons, John Herbert, Sir, 1868-1957 · Cambridge University Press · leaf 79
diminution in saturation. Those red ravs which have little (620 — 670 /jl/jl) or no (beyond 670 /x/x) scotopic stimulus value, show no change. The effect of Purkinje's phenomenon is seen graphically in Fig. 18, where the abscissae represent intensities of red lights (670 jx/x) and the ordinates… … Fig. 18. Curve of equivalent luminosities of red (G70 /x/x) and blue (450 /x,u) lights at different intensities (slit-widths). (Konig.) Although different colours alter their appearance on diminution of their intensity it might be thought that accurate photopic matches would remain valid for the…
Color vision
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
