Step-by-step Chroma key compositing
1 Pick a background
First, you’ll need a plain background. We’re lucky to have a green wall we can use, but there are other options. It doesn’t even have to be green – the key requirement is that it’s a solid colour that’s different from your subject’s hair, skin, and anything they’re wearing. Blue and green are the most commonly used colours. If you don’t have a suitable wall, you can use coloured card or paper.
2 Get the right lighting
The background should be evenly lit to avoid harsh shadows. One of the easiest ways to achieve this is to shoot your video during the day, in natural light, making sure you’re not standing directly in front of a window. You might need to experiment with closing the curtains or blinds, and positioning yourself in different places around the room.
3 Record your video
Next, record your video. It’s a good idea to use a tripod to keep the camera steady, or ask the person who’s doing the recording to lean against something sturdy and stable like a piece of furniture or a wall. Once you’re happy, transfer the video to your PC in the same way you would normally – wirelessly or using a USB cable – and then go to www.shotcut.org.
4 Get Shotcut
Click the red ‘Click to download’ link at the top of the page, then choose either the 32-bit or 64-bit installer, depending on your version of Windows. If you’re not sure which to choose, follow the instructions from Microsoft at http://bit.ly/2rtEwhG. Once it’s downloaded, run the installer, leaving all the default options selected, then launch the program.