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Here's one of many videos created using Synthesia music visualization software. The upper part of the screen looks like it's drawn by the software. The lower part looks like it shows a real piano and real performer hands shot on camera.
How does it happen that as "bricks" approach the piano keyboard the keyboard and the hands are being illuminated by light of the same color and matching intensity as if the "bricks" were real and actually emitted light?
When people like Rousseau record their videos, they have a specific lighting pattern setup on their keyboard so the LEDs at the top of the keys light up when pressed, and at the same time as they record the playing with the lights, they record the MIDI and throw it into a Synthesia file or some other software. Then they just overlay it on top in editing.
Basically, they have a keyboard that has LEDs and software that allows them to set up rules for the LEDs and they record a video of them playing, and then overlay the resulting software video on top.
