we have a problem with multiplied images. first we take the 3D Footage into AE over the filmed plate. then we color grade the 3D Footage. everything looks ok in AE, no edges (well known from pre-multiplied image). but after that we render out only the 3D Layer and take it into shake to do tracking etc. then the error occurs and we get the edges. also if we re-import the images into AE it's visible.
so normally in shake i do an mdiv before any color correction and after that mmult. is there a way to do this in AE too. or how does AE handles pre-multiplied. the help files won't give me any specific answer to this topic.