Understanding the Principles of Light Behavior - Photographic Rendering with V-Ray for SketchUp - page 181

As you can see, the amount of color now being carried around this environment by
means of the three elements mentioned earlier has altered the look of the render
quite dramatically. For a client who wanted to keep their nice and neutral looking
walls intact, this particular final result would be totally unacceptable. To make an ef-
fort to control the color bounce, let's perform the following steps:
1. Open up the V-Ray options dialog box by clicking the toolbar icon.
2. Click to open the Indirect illumination rollout.
3. In the Post Processing section, reduce the Saturation value from 1.0 to
0.15 .
4. Close the options dialog box.
5. Click on the render button up on the V-Ray toolbar.
Now when the render starts up, you may be tempted to just hit the Esc key and can-
cel the render as nothing appears to have changed, and the GI precalculation looks
every bit as saturated as before. However, be patient; we have to keep in mind the
fact that the saturation control is housed in the Post Processing section of the GI
options, which means it will work its magic at render time and not before.
What we get shows quite a dramatic reduction in the amount of color bounce in the
environment. Of course, now there is a difference in the color found in the carpet, but
in reality that should be expected as the carpet itself is no longer receiving the fully
saturated bounced light that it was receiving before.
As a compromise, we could of course work with less drastic values in the saturation
field, which would have the effect of reducing rather than eliminating the color bleed
in the scene. This can often be an acceptable compromise as it balances realism