If you are already using the Synthesia app on a computer, you may like to use it on Windows or Mac computer. PS: Getting some knowledge about Track Mattes is one of the most useful things you can learn in After Effects - they have a lot of uses.Do you want to download Synthesia For Windows and Mac? Then this tutorial will help to solve your problem. I've tried to be as clear as I can, if there is anything that is unclear let me know. You should now have little green balls coming our from behind the green bars - now is the time to work on the actual particles to get them to look like you want. Now go to your Particular settings and set it as per my earlier post using Precomp 2 as the Layer emitter. Using the pen tool draw a tight mask around the keyboard only. Precomp 2 (turn off the eyeball - make it 3D)
Now, in your Main comp: make a solid and add Particular to it and move it below your video layer Turn off the eyeball for the video layer and you should have a thin slit which the green bars will move through with a transparent background. Select the Green Solid layer and paste the mask (Ctrl + V). 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.
In Precomp 2 turn on the eyeball switch beside the video - the video will reappear. Precompose Precomp - it will automatically be named Precomp 2. 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 it - call it Precomp ( make sure you Move All Attributes and Open New Composition for the precompositions we're going to be doing). To put the particles behind the bars adds quite a level of complexity.
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