Deane Judd was very interested the effect of light polarization and degree of diffusion on the appearance of objects.  He made important contributions to the fields of colorimetry, color discrimination, color order, and color vision.  Judd defined the scattering power for a sample as , where  is the particle diameter.  This is consistent with the belief that the scattering from a single particle is conceptually more important than the derived coefficients.
The above Kubelka–Munk equation can be resolved for the ratio  in terms of .  This led to a very early (perhaps the first) use of the term "remission" in place of "reflectance" when Judd defined a "remission function" as ,  where  and  are absorption and scattering coefficients, which replace  and  in the Kubelka–Munk equation above. Judd tabulated the remission function as a function of percent reflectance from an infinitely thick sample.  This function, when used as a measure of absorption, was sometimes referred to as "pseudo-absorbance", a term which has been used later with other definitions as well.