You need to apply the cineon converter TWICE. Once to move your footage to linear space, and once to bring it into logarithmic space. Here's one way to do it, using adjustment layers:

1. (Top Layer) Adjustment layer: Cineon Converter effect: Linear to Log

2. 3D composite layer

3. 3D composite layer

4. 3D composite layer (etc, etc)

5. Original footage: Cineon Converter effect: Log to Linear

With this kind of setup, your 3D composite layers are doing their work in linear space, which can give a nicer composite if you have 10-bit or higher source footage (which I"m assuming you do, as you are using DPX footage). Keep in mind, however, that the difference is often quite subtle from what you'd get if you were working the entire time in log space.

If your DPX is looking a bit washed out, place an adjustment layer over the cineon converter layer and apply the levels effect. Clamp the white and black levels a bit to make it a bit more contrasty.

Ben Unguren

Motion Graphics & Editing

http://www.mostlydocumentary.com