Join Mark Christiansen for an in-depth discussion in this video Solve matte lines with Refine Hard Matte, part of After Effects Compositing: 4 Color Keying.
- At this stage it's worth keeping in mind…that we've taken on a key…that really was not shot properly…and we're seeing the problems…that come along with that.…So by trying to solve for this blue shirt…that was shot against the blue background…I now have the bane of the compositor's exhistence…matte lines.…These were introduced when I brought down clip white.…So if I close this up…you can see those matte lines coming in…as clip white comes down.…
At this point I have a key here that's…really neither here nor there.…The edges really aren't that great in the problem areas…and they're really not really that great…in the areas that should key well…which is his arms and face.…So now I have a dilemma.…If I want to do it the hard but correct way…I would divide it up…and actually do moving mattes for each area…that has the good stuff.…Now I'd have to avoid…as much of the blue costume as possible…so it's somewhat painstaking.…
Let's suppose for a moment…that I don't care quite that much…about this particular key.…for whatever reason.…
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 46s
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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: Solve matte lines with Refine Hard Matte