Select the heading "Masks" and copy it (Ctrl +C). Toggle open the video layer and you will see Masks listed. Use the pen tool and draw a wide thin box just above the top of the keyboard - this is the area that the particles will appear from*. Turn on the eyeball switch beside the video - the video will reappear. This will leave you with only green bars on a transparent background. Toggle the box open and select Alpha Inverted Matte. You should see a TrkMat pulldown box beside the pickwhip symbol - if not press the Toggle Switches/Modes button at the very bottom of the screen and it should appear. Add a new solid and make it the same green as the bars (use the eyedropper tool and sample the green from the Keylight swatch). You should see a checkerboard pattern where the green used to be which shows that it is transparent. In Precomp add the Keylight Effect and key out the green bars (toggle the Transparency Grid on at the bottom of the screen, it's the checkerboard symbol next to Active Camera). ![]() ![]() In your main comp have your video, duplicate it (Ctrl +D) and Precompose the top layer - call it Precomp Here is a simpler way that will render much faster: The original poster needed to have the particles come from behind the bars, which makes the process far, far more complicated and is probably unnecessary.
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