Albedo

(Term of radiometry/photometry)

Generally, albedo is just another term for reflectance.

In the Radiance software, it is used as the unitless ratio between the scattering coefficient and the extinction coefficient for a participating medium. An albedo of 0 means that the particles do not scatter light. An albedo of 1 means that the particles do not absorb light.

The Radiance software treats the red, green and blue components of the albedo seperately.