I am working on a 16bpc project in after effect. I have setted a linear workflow in the project setting and my project is setted to 16bpc. I have some 3d graphics wich are 16bpc and i have a quick time movie wich is 16bpc (trilion of colors it says in the info) , I did my compositing and applied my effects. At this point I need to render a quicktime at 16bpc,is that possible in after effects? (cs5 or cs5.5) , if not wich is the best file format that let me export at 16bpc withput the loss of quality?
There is no native 16bit QT CoDec. You will have to use image sequences - TIFF, PSD - or use a commercial QT CoDec like the ones from Blackmagic that support higher bit depths.
As Mylenium says, there is no such thing as a 16-bit Quicktime. But since we don't know what you need to DELIVER to the client, it's difficult to give accurate advice. Can you elaborate on that?