eval_pigment returns the 'linear' color of an object, not a gamma-bent color
(i.e., not at gamma 2.2.) I.e., it returns an rgb color, not an srgb one. If the
*original* color of your object was chosen to be srgb <...> rather than rgb, and
you want to use the returned srgb equivalent in your scene or for some other
purpose, the result should be used as  srgb <0.2,0.5,0.75>, for example, not rgb
<...>.

But if your original color was  rgb <...>, then eval_pigment will return that
same color.

As Clipka noted, eval_pigment doesn't take into account the *illumination* of
the object-- lighting, shadow, phong, etc--, just the basic strict color found
there.

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