Try to use 16-bit colour depth or higher to avoid the occurrence of banding – as multipasses sum up multiple layers and then have the result transformed into monitor colourspace 8-bit usually isn’t enough.
For special passes like UVW data, Normals maps etc. activate the setting “Preserve RGB” in the “Interpret Footage” dialog to use the “raw” uncorrected data (not influenced by any color profile).
- See more at: http://www.helloluxx.com/tutorials/cinema4d-2/cinema4d-rendering/linear-workflow-in-cinema4d-and-after-effects/#sthash.jnHMzn4O.dpuf