If you have Keylight and want to do keying work, then you need to know what this tutorial provides.
There are a lot of After Effects tutorials available. And many of them describe green screen keying.
I’ve watched well over 120 tutorials on AE and at least a dozen of those covered various aspects of keying. So why would anyone create another tutorial specifically on keying with The Foundry's Keylight in After Effects?
Because Professional Keying with Keylight (with Angie Mistretta), brought to you by the Expert Training Series at Toolfarm, is different. It teaches how to use the features in Keylight to do professional quality keying. And most importantly, it teaches you how to think about keying.
Figure 1. Training Layout for the Toolfarm Expert Training Series.
This is not one of those “tour of the interface” tutorials. You know the ones I’m talking about: “The brightness slider is used to control the brightness. Moving the slider changes the brightness.” No way.
And this is not one of those “single method” tutorials that shows a technique that works well with the sample footage but falls apart when you try it on your own footage.
This training shows you how to recognize keying problems, and how to use the tools in Keylight to solve those problems.
Figure 2. The Green Screen Clip
The tutorial starts with a typical green screen clip. It was shot on an HVX in 720p24n mode. I saw this clip and I said to myself “This looks like something I would shoot. Pretty good.” Then the tutorial tears apart the image as the host explains what she sees in it. There are a half-dozen problems with the clip ranging from poor exposure to green light spilling on the actor’s skin to a dark line and halo artifact caused by HD compression. The host teaches you how to see differently.
Step-by-step she walks through building a multiple-key mask using a dazzling array of tricks in Keylight. As she does this, she points out the problem, tries a solution, and analyzes the results. I was surprised to hear “No, that didn’t work. Let’s see why.” And then she shows the limitations of one technique after another and what to do next. It’s not one technique, rather it’s a systematic way to break down the quality issues in a key and fix them.
If you have Keylight and want to do keying work, then you need to know what this tutorial provides. 
