What has all your premultiplied vs. multiplied have to do with color correction? Your whole workflow sounds awful. You simply combine everything in one program and render it out as a flat clip and that is it. Nobody would render elements with Alpha in AE and color correct them just so he can then assemble them in Premiere over his footage there. Makes absolutely no sense. Do whatever you must in Premiere, move over to AE and use it there, including your final color correction for your 3D elements, rtender it out, import the result in Premiere and replace the clip.
Hi Millenium, if you don't know what "What has all your premultiplied vs. multiplied have to do with color correction", this discussion can't to go forward, not with you.
And try also to read correctly what people write. There are three type of clip to composite in my example: Keyed clip , 3d Obj and 3d obj by 3DE videocopilot. All these clip have a different ways to build alpha and maybe, 3D Element plugin doesn,t use alpha...
And please, google what is the different beetween Straight and pre multi footage in Color Correction.
The only time you need to worry about premultiplied and straight is when you render a file in AE that contains an alpha channel.
You're doing color correction. You don't NEED to worry about alpha channels. Alpha channels don't apply to your situation.
Dave is correct. (And so is Mylenium. No need to be rude, when he was jsut trying to explain that you were introducing unnecessary complexity.)
The color matting is removed to interpret the alpha channel when you import the footage. After that, any color correction that you do to a layer based ont hat footage item doesn't have anything to do with whether the channels were straight or premultiplied for the source item.
You color-correct your individual items to amke them match as part of the compositing process in After Effects. Then, if you want to do a color grade of the shot in Premiere Pro along with other shots, you'd be working on the single rendered/flattened composite, so the details of the original elements that went into the composite are irrelevant.