Track Matte Confusion

Question

Hello, all! I'm not computer savvy at all so I've been looking up many tutorials on rotoscoping, greenscreening, etc lately. I have this character I green screened in an avi. file to add to a real life setting (Spae Jam effect) that I've been trying to track matte. With my limited understanding, I precomped, opened a new view comp, input Layer > New > Solid, eyedropped the color, and tried to parent/link the avi. file with the solid to be able to add blend modes and produce shading/lighting effects to the character but absolutely nothing happens. I genuinely don't know what I'm doing wrong or if it just doesn't register what I'm doing. Can anyone please help me? I can send over the AE file itself so you guys can see my screen, if that's allowed?

Rick Gerard · Answer

Share a frame of your shot. I have used a layer with garbage mattes (masks), and Keylight applied as a track matte to remove a background and as an Inverted Track matte to isolate a foreground element on a new layer.

To create 100% transparency, the Track Matte layer must have luminance values from black to white (0 - 256 if you are working in 8-Bit color, 0 to 1 if you are working in 32-bit color), or it must have an alpha channel with full transparency.

Have you checked the User Guide or typed Track Matte in the Search Help field in the top right corner of After Effects? Once you understand where the transparency comes from and how to use the UI, it's pretty easy to figure out. If you could use the Toolbar or drag and drop a screenshot to the reply that shows the modified properties of the layer you are trying to use, we could give you a pretty good step by step to create your transparency.

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