I just shot a commercial on 35mm and I'm adding type in after effects. When I bring the footage into AE as a quicktime movie (uncompressed) from FCP, it looks milky and washed out in the AE preview and same when i export back to FCP:
I looked at the quicktime movie that was imported into AE from FCP and its fine. it only happens in AE.
Try this: Go to Project Settings (File > Project Settings) and enable the "Match Legacy After Effects Quicktime Gamma Adjustments" checkbox.
This should make Uncompressed and other Quicktime files look in AE just as they do in Quicktime Player.
Does this do the trick for you?
For more information, see QuickTime and gamma in non-color-managed projects in After Effects Help.
For a more comprehensive solution -but more scary, I know-, you may want to try a Color Managment workflow: Assign a SDTV NTSC or HDTV (REC.709) project working space (in project settings) and make sure the footage input profile is assigned also as STDV NTSC or HDTV (depending of course on the nature of your footage).