Martin, L. C. (Louis Claude), Gamble, William · London, Blackie · leaf 74
COLOUR METHODS 50 to blue-sky light may be made by increasing the relative amount of ultramarine. In fig. 23 curve 2 represents the blue-sky light, and curve i the artificial light corrected almost to blue-sky quality. … 0-4 0-7^ Vvaue Length Fig. 22. — Correction by Vermilion If exact correction is required, the efficiencies of practical units of any type for sunlight eflFects may be inferred from the relation of practical attainment to the " maximum possible " in the case of blue-sky units. The ideal efiiciency…
Color photography · Color printing · Color
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
