Adding Photographic Touches in Post-production - Photographic Rendering with V-Ray for SketchUp - page 333

Now, when we added our Z Depth VFB channel to our rendered output back in V-
Ray, you may have wondered why we didn't fine-tune the depth settings for the shot
using the controls provided. Well, while we could most certainly have gone ahead
and done that, but due to the fact that we were rendering out to floating point, this
seemed like a redundant step, as again we can easily edit our depth settings in post.
To do that, let's first of all double-click on the ZDepth_Control pre-comp in the lay-
er stack to open it up and then perform the following steps:
1. Over in the Effects & Presets panel, type invert and then drop the
32-bit Invert effect that appears in the results area onto the Materi-
als_Final.ZDepth.exr image (this gives us a white to medium-grey image as
opposed to the medium-grey to white that we had).
2. Next, we need to shift the area of focus around a little, so again in the Effects
& Presets panel, let's type out levels and then drop the 32-bit Levels effect
onto the Materials_Final.ZDepth image as well.