This video provides an introduction to chroma keying and an overview of Continuum keyers and matte effects.
- [Instructor] It's time to discuss chroma key effects. And chroma key effects are designed to remove a certain color from the background, for example, green of green screen. You can use one of those effect to, say, remove the green of this shot and convert it to alpha transparency, that would allow you to save the foreground, which is this unicycle rider, and place that over a new background layer. Boris Continuum includes a number of chroma key effects, plus effects to adjust the resulting matte. Let's take a look at those.
With this layer selected, I'll go to Effect, Key & Blend, and here are all those various effects. I'll discuss them in terms of general categories. There are simple keyers like chroma key and linear color key, they have a limited number of properties, great for simple scenarios. Could be a simple green screen, or a situation where you want to remove a certain color, like the blue from a sky. Along those lines is the Two Way Key, where you can sample the foreground color that you want to keep, and the background color, that you want to get rid of.
There's also a lumina key, with Linear Luma Key. And instead of color, this attacks a certain brightness, great for high-contrast situations also. There's Make Alpha Key that transfers RGB values into the alpha channel, again if you have a high-contrast shot, this may work. There's a all-in-one keyer that tries to do the color keying, plus adjust the resulting matte, and that's called Chroma Key Studio. Now, in terms of adjusting the alpha matte, there are a number of effects that just do that. For example, Matte Choker you can use to erode or expand the matte edge.
Same with Composite Choker. There's also Matte Cleanup to improve the overall quality and contrast of the matte. You can also use Alpha Process to improve the matte quality. The next one is very unique by itself, and it's called Light Wrap. Light Wrap will take a new background layer's color and add it to the edge of the keyed foreground. So once you put your new background in underneath the keyed foreground, you can have some of that light quality wrap around the edge. And that helps connect that foreground to the new background.
We'll use that a little bit later. In this menu is also a standalone Pixel Chooser, in case the effect you're using does not have that built in, and then there's several effects that are designed simply to blend layers together, but don't actually chroma key. For example, Composite and RGB blend. These have their own internal blending modes to blend upper and lower layers. One more unusual one is a Premult. This is designed to pre-multiply alpha against RGB. Sometimes it's necessary when you're working with green screen footage. Now the last one is probably the most powerful one. And this is a Primatte Studio chroma keyer.
We're going to demonstrate that in a few moments.
- Working with common Boris controls
- Applying stylistic effects
- Relighting with Boris light effects
- Adjusting colors and color grading
- Warping footage
- Keying greenscreen with Primatte Studio
- Motion tracking
- Adding particles with Particle Illusion
- Working with 3D text and VR