Just so that you’re clear on what it means that some effects work in certain color depths:
The effects that don’t work in 32-bpc can still work on a layer in a 32-bpc project. The effects just don’t preserve the precision and over-range values that it is possible to have in a 32-bpc project. If you were already working in 8-bpc and only switched to 32-bpc to fix certain problems, then this limitation might not be an issue for you. For more information about color depths, see this page: “Color depth and high dynamic range color”
If you do want to preserve as much of the over-range information in a 32-bpc HDR (high-dynamic-range) image as possible while using a low-dynamic-range effect, you can use the HDR Compander effect.
———————————————————————————————————
Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
———————————————————————————————————
If a page of After Effects Help answers your question, please consider rating it. If you have a tip, technique, or link to share—or if there is something that you’d like to see added or improved—please leave a comment.