Dichromatic reflectance model
Encyclopedia
In Shafer’s dichromatic reflection model, scene radiance has two components:

cb is the body reflected component
cs is the surface reflected component
mb and ms are scale factor
Scale factor
A scale factor is a number which scales, or multiplies, some quantity. In the equation y=Cx, C is the scale factor for x. C is also the coefficient of x, and may be called the constant of proportionality of y to x...

s depending on illumination
Illumination
Illumination, an observable property and effect of light, may also refer to:* Illumination , the use of light sources* Illumination , the use of light and shadow in art...

, view directions and surface orientation.
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