I'm working on a lower third and wanted to add one of the Digital Juice Overlay effects (black & white animation). Normally you just drop in the layer and add the multiply blend mode. This works fine for the content portion of the comp, but anywhere that there is transparency/alpha channel, it just shows the DJ layer instead of blank.
Is there a way to have After Effects not affect, or ignore the empty/transparent areas with the blend modes?
Now with texture added using the set matte effect using the same red background matte. Note the faint white line around the edge, and the white bleed through on the triangles. I tried rendering pre-matteed and un-matted with no difference.
Can you apply everything except for the alpha in a precomp? (I don't mean just on the grunge - I mean everything) and then cut out the shapes you need in the main comp? (Like, precomp everything, then use a duplicate of the red stuff as a track matte for the precomp.)
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