Young-Helmholtz Theory

The retinal rods are more sensitive in the ultraviolet, and there are specialized cones for the blue, green and red regions respectively. Since these sensitivities are slightly dilferent for each human being, the 1931 Commission Internationale de I Eclairage (CIE) defined the response curve for a standard observer in order to overcome this difficulty. This curve, which is illustrated in Fig. 2.9b is actually three curves, one for each response region of the spectrum, and it is based upon the Young-Helmholtz theory discussed above [18, 19]. 

POWDERS,HANDLING - DISPERSION OF POWDERS IN LIQUIDS] (Vol 19) Young-Helmholtz color-vision theory... 

---