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?

Dieser Kurs bietet eine umfassende Einführung in Adobe After Effects und behandelt grundlegende Werkzeuge und Techniken für Animation, Motion Graphics und visuelle Effekte. Sie üben gezielt, um vollständige Animationen und fortgeschrittene Übergänge in eigenen Kapiteln zu erstellen. Am Ende verfügen Sie über die Fähigkeiten, dynamische Animationen und hochwertige Videoinhalte durch praxisorientierte Projekte zu gestalten.

Erkundung der zentralen Benutzeroberfläche und Funktionen von After Effects, einschließlich Navigation durch Kompositionen, Ebenen und grundlegende Werkzeuge. Vermittlung effektiver Projektorganisation und grundlegender Kenntnisse zu Transformationen als Basis für weiterführende Animationen.

Keylight

Mentioned shortcuts

Task