If it's just a still image, and all you're going to do is add text and adjust  color and density (or even more complex editing and compositing - doesn't matter), just save it out as any image format you want to work in (TIF, JPG, BMP, etc.).

Open Photoshop, open the image file, and go crazy with it.

If you're talking about moving animation - then you might wanna export it for postwork in After Effects.

If you're talking about masking, activate Z-Depth for your camera and well as the options for Effects in the render tabs.

Hope this helps-
-Lew ;-)