Rg Chromaticity - Conversion Between RGB and Rg Chromaticity

Conversion Between RGB and Rg Chromaticity

Given a color (R,G,B) where R, G, B = intensity of Red, Green and Blue, this can be converted to color where imply the proportion of red and green in the original color:

The reverse conversion is not possible, as the intensity information is lost during the conversion to rg chromaticity, e.g. (1/3, 1/3) has equal proportions of each color, but it is not possible to determine whether this corresponds to dark gray, light gray, or white.