Adding Photographic Touches in Post-production - Photographic Rendering with V-Ray for SketchUp - page 330

Now, straightaway we should spot a bit of a problem. Due to the image sampling that
has been applied to our mask, we are getting some very bright fringing, or halo-ing,
along the edges of some of the masked geometry, especially the chrome barriers
and display cases closest to the camera. To fix this, let's perform the following steps:
1. Come over to the Effects & Presets tab, and in the search field, start to type
the word simple .
2. In the search results area just below, we should now see the 32-bit Simple
Choker effect. Grab this and drop it onto the reflection layer, setting the
Choke Matte value to 1.6 .
3. Finally, we can expand the reflection layer's Transform controls, and in
there, set the Opacity level to 12% .