Join Mark Christiansen for an in-depth discussion in this video Dividing the matte: Introduction, part of After Effects Compositing 04: Color Keying.
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- I'm gonna throw out a metaphor for when shots get more complex, when there's more color spill, and when edge detail is a little more critical. Now, you wouldn't move out of your apartment by trying to carry all of the items in one load. If you did, you'd probably drop some things and you'd be pretty exhausted at the end. And you'd probably think it was not worth trying to do that. Similarly, with a complex green screen shot, you're better off trying to break it down into manageable portions rather than trying to get the whole thing in one pass.
So in this section I'm gonna show you how to break the job down so that you're carrying more manageable amounts. Which is to say, breaking down the mat into smaller, more bite-sized sections that are easy to manage. The extra, little bit of trouble can save you a lot of trouble later in the process.
Beginning with a brief explanation of the keying process, Mark takes you through the steps involved in creating a perfect green-screen key: generating a rough matte, eliminating color spill and matte lines, and refining problematic edges. He shows how to work with Keylight and Primatte—two indispensable keying tools in After Effects—and explains when to use one over the other. And for times when green screen won't work, he shows how to generate high-contrast mattes, or luma keys, based on the luminance data in your footage. Last, learn about compression and how to prep a shot for keying.
- What is color keying?
- Using garbage mattes
- Getting started with Keylight
- Understanding the Screen Color, Clip Black, and Clip White adjustments
- Eliminating spill with Advanced Spill Suppressor
- Using Key Cleaner to refine edges automatically
- Dividing a matte with holdout mattes
- Breaking down a complex color key
- Creating a luma key with Extract
- Setting up sky replacement
- Using Refine Soft Matte to improve edge detail
- Feathering edges with Channel Blur
- Knowing when to avoid green screen
- Prepping a shot for keying
Skill Level Intermediate
After Effects Apprentice 12: Tracking and Keyingwith Chris Meyer3h 54m Intermediate
VFX Techniques: Crowd Replication with After Effectswith Lee Lanier2h 54m Intermediate
VFX Techniques: Tracking Objects onto a Facewith Lee Lanier2h 42m Intermediate
1. Work with Keylight
2. Manage Edges and Spill
3. Divide a Matte for Best Results When Keying
Add a holdout matte1m 38s
4. Solve Problematic Edges
5. Complex Color Keys and Primatte
6. High-Contrast Mattes (When There Is No Green Screen)
7. Prep for Success When Color Keying
Prep a shot for keying3m 4s
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