After Effects Compositing Essentials Color Keying

Color Keying教程介绍

在AE软件中进行视频抠像也是我们后期工作的一个重要区域，

本期教程将详细的讲解利用Color Keying（色度键）对绿屏画面进行抠像处理，

通过一系列的优化处理使得画面更加的干净彻底，然后对抠像画面进行了后期合成处理。

教程为高清视频教程，英语对白（无中文字幕），含工程文件

 

Lynda – After Effects Compositing Essentials Color Keying

Color keying, also known as chroma keying, lets you shoot a foreground scene and insert it into virtually any background; this can save you money and allow you to create shots that are impossible or highly dangerous to take as a single shot. For it to be effective, the key is in the details. In this course, Mark Christiansen shows how to produce feature-film-quality keys in After Effects that fit well within their new scenes, while retaining the subtle details—be they strands of hair or soft or translucent edges—that make the results believable.

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.

官网：http://www.lynda.com/After-Effects-tutorials/114914-2.html

 

Topics include: 知识点

What is color keying?  什么是色度键

Using garbage mattes   蒙板利用

Getting started with Keylight   简单抠像

Understanding the Screen Color, Clip Black, and Clip White adjustments  分析画面

Eliminating spill with Advanced Spill Suppressor   细节处理

Using Key Cleaner to refine edges automatically   边缘优化

Dividing a matte with holdout mattes   图层遮罩

Breaking down a complex color key   复杂操作

Creating a luma key with Extract  使用亮度键

Setting up sky replacement   贴图置换

Using Refine Soft Matte to improve edge detail   用蒙板细化边缘

Feathering edges with Channel Blur   羽化/模糊通道

Knowing when to avoid green screen   绿屏抠像技巧

Prepping a shot for keying   镜头合成

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