Summary  
This chapter explains how to implement a chroma-key filter by selecting a target background color, tuning threshold parameters (clip black/white, shrink/grow, softness), and refining the result with masks and duplicate layers.  

General domain of usage  
Video compositing / visual effects

**Keylight** is an effect that helps you remove a green or blue screen from the background of your video clip.   

This gives you the ability to **change the background** of a subject shot on a green screen or use any footage from the internet that has a similar setup.

Definition

Chroma key is often used in visual effects. It's typically **green or blue** because these colors are completely opposite from human skin tones on the color spectrum. If you want to shoot green screen videos yourself, make sure you have proper lighting.   
Your subject should be as far from the green screen as possible, and the background should not contain any shadows from the subject.

In post-production, keying is a very precise process, but we will cover just the basics today.


**In this chapter, you've learned**:
- How to remove backgrounds using the Keylight effect;
- Key Keylight parameters to adjust for better results;
- How to refine keying with masks and duplicate layers.


## Task

Cut out green screen from the clips and place it on any background.


Why is green or blue typically used for chroma keying in video production?

This course provides a comprehensive introduction to Adobe After Effects, covering essential tools and techniques for animation, motion graphics, and visual effects. You'll engage in precise practice, learning to create full animations and advanced transitions in dedicated chapters. By the end, you'll have the skills to craft dynamic animations and high-quality video content through hands-on projects.

Explore the core interface and functionality of After Effects, covering how to navigate compositions, layers, and essential tools. Learn effective project organization and develop a solid understanding of basic transformations, forming the foundation for more advanced animation work.

The focus is on mastering key animation principles, including keyframing and easing, while applying them to create a complete animation and designing motion graphics transitions in practical examples.

Explore advanced features such as chroma keying with the Keylight effect, using masks to refine visuals, applying Adjustment Layers to multiple elements, and improving project organization through pre-composing. Practice creating professional transitions and master techniques like zooms and whip pans with precise execution.

Keylight

Mentioned shortcuts

Task