Make a floor (solid white) transparent while keeping the shadow

Hello

I have a project where I have to throw me a shadow of an actor on the ground. I have created some solid time as a floor and threw shade for my taste. I want to be able to take the floor, I created transparent everything keeping the shade.

I tried to apply the SHIFT channels based on Luminanceand then apply the reverse effect. I either get a black ground (if I use the RGB channel) or complete transparency with no shadow seen that if I put the channel invert alpha.

Any help would be appreciated.

Best regards

Bob

Adolfo's right. You apply effects to the white layer. You just to drop a solid black below 2d then of set the blending mode to Silhouette Luma. That's all there is to it.

Tags: After Effects

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