Join Mark Christiansen for an in-depth discussion in this video Feather edges with Channel Blur, part of After Effects Compositing 04: Color Keying.
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- So if you're finding that refined soft matte…is not worth the extra overhead and trouble…to tweak it and you're looking for a simpler option…to refine your matte extraction…I would suggest a couple of very…simple ordinary tools.…One, to feather the mask…and the other to just control…the threshold angle a bit further.…So for this I'm going to zoom back in on the tree…and turn off the background.…So again we have a bit of thresholding here…but it's a bit chunky…and so to feather that…hidden among the blur effects is channel blur.…
Now if I go heavy on this…not only does it not look right…but you're going to see something that I need to do here…which is…set repeat edge pixels use at full frame.…I'm going to use this sort of very…very low level.…In fact, by turning on the…modifier key, holding down command…because I'm on a Mac I can increment by tenths…and that's about right.…
Now this is different from altering…the threshold with extract…because I'm taking the threshold that was already set…and just softening it.…Now I'm going to go with that result…
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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