Join Mark Christiansen for an in-depth discussion in this video Track a c-matte to fill holes, part of After Effects Compositing 04: Color Keying.
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- Completing what had looked like…a pretty challenging key is now just a simple matter…of a little bit of clean up.…Now you've heard me say over and over again…that keying is just about edges…and our edges are really done…and what's left are some gaps in the foreground.…If the edges of this handheld device were problematic…we could track in a mask,…we could rotoscope, even that wouldn't be too difficult.…But this is going to be even simpler…because that's not the issue at all.…
So I'm going to duplicate the arm pass, move it down.…And rename it "screen".…And you can see actually that the hole is already filled…the only problem I have with that…is that it's affecting the edges…so rather than let them build up that way…I'm going to solo this layer…create a rectangular mask just around…the area that I'm concerned with.…
And in fact, I don't need that other mask.…So just get rid of that one.…I'll set a key frame here.…And let's go back to where this first appears.…It's probably easier if I turn this off.…So it emerges over there…
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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