Join Mark Christiansen for an in-depth discussion in this video Set up a simple sky replacement in 32 bits per channel, part of After Effects Compositing: 4 Color Keying.
- Extract is a useful tool for a sky replacement…because skies have a lot in common…no matter what they look like.…They all are in more or less the same color space…if they're going to match the shot at all.…Now obviously right now…we see some pretty heavy-duty matte lines going on here.…Rather than manage those…and try to get them to match this sky…my suggestion is to get this sky to match the shot…and then adjust the entire thing together…as if it were one.…
Let me show you what I mean.…So this is something you might not initially want to do…or instinctively want to do but…I'm going to actually kind of ruin…this nice contrasty sky…and notice that it actually is now better comped…with this scene.…Now the question is…will the shot ever look any good?…I can still see the matte lines.…
I can be so aggressive with this…that they actually basically disappear.…And let's try that as a starting point.…The key is going to be to…add a color correction to bring this back.…We'll do that with an adjustment layer…so it applies to both.…
Author
Mark Christiansen
Released
12/7/2014Beginning 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
Duration
Views
Q: How do I locate the exercise files for chapter 5, 6, and 7 of this course?
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Introduction
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Welcome1m 50s
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Using the exercise files2m 23s
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1. Work with Keylight
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2. Manage Edges and Spill
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3. Divide a Matte for Best Results When Keying
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Add a holdout matte1m 38s
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4. Solve Problematic Edges
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5. Complex Color Keys and Primatte
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6. High-Contrast Mattes (When There Is No Green Screen)
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7. Prep for Success When Color Keying
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Prep a shot for keying3m 4s
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Video: Set up a simple sky replacement in 32 bits per channel