How to green screen in HitFilm
Green screen is used in all types of movies, to put actors in places that would otherwise be expensive or impossible. Maybe you’ve filmed your subject against a green screen, but aren’t sure what the next step is. Today we’re going to look at 3 effects you can use to key out your green or blue screen background so that you’re left with a clean shot of your subject, ready for compositing. If you’re using HitFilm Express there are two main effects you can use to chroma key: Hue and RGB key, and Color Difference Key.
The Color Difference Key effect is the easiest to use. Simply drag the effect onto your video layer and select the color of your screen in the Controls panel. Then adjust the Minimum slider to key out the color, and the Max slider to bring back parts of your subject you don’t want keyed. The Gamma slider allows you to further adjust the balance between the two, and you can View the Matte for a grayscale representation of the key. The Hue & RGB Key effect lets you choose whatever color you want to key out. You can then adjust
The strength with the Tolerance slider, and blur the edges of your subject with Edge Softness. If the effect is taking out similar colors that you don’t want, try changing the Match Colors By to RGB, which will limit the range it keys. Now for the best results you’re going to want to use the Chroma Key effect. This is in HitFilm Pro by default, and can be found in the Composite: Pro Keying pack for Express. After you select your background color and adjust the Gain, the Chroma Key effect gives
You several options to get it just right. These include settings to adjust the edges, the strength of the key, and spill suppression to get rid of any lingering color. Now that you’ve got the green screen keyed out, the next step is to composite your actor into the scene – this is the subject of our next tutorial. If you're watching this in the future, it's already available here. Otherwise, here's another great tutorial to fill the time. Thanks for watching and I'll see you all in the next video.