Think Bigger From Filmora User Guide
Chroma Key
Chroma Key is used to remove specific colors from overlay images and videos. For example, if you capture a subject against a "green screen" background or cover part of the subject with green, you can use Chroma Key to remove the green.
You can then place the subject onto different virtual backgrounds and make some cool shots like creating a superhero flying through the sky.
Use Chroma Key to Make Selected Colors Transparent
Enable Chroma Key
Double click on the clip in your timeline to open the editing panel, check the box next to Chroma Key. You can also select the video in the timeline first and then click on the Chroma Key icon on the toolbar to enable the Chroma Key feature automatically.
Select Color
Click on the eyedropper tool to pick a color in the image or video clip that you want to make transparent in the Preview window.

Adjust Settings
You can adjust the following settings to alter the borders, transparency, shadows, and much more in the video.
- Offset: adjusts the visibility of the backdrop
- Tolerance: controls the width of the range of hues of the key color
- Edge Feathering: softens the edges
- Edge Thickness: adjusts the edges of the subject
- Alpha Channel: turns anything keyed out appearing black and anything not keyed out appearing as white.
Creative Way to Use Chroma Key
The Chroma key makes a color range in the top layer of the clips transparent, therefore the background video clip or image behind the top layer could show through. In this way, you can add the green screen video as an overlay to composite a PiP video.
Import Videos to Media Library
Import both your background video and green screen clip to the media library.
Drag and Place Videos to Timeline
Drag the background clip to the video track on the timeline, and green screen footage to the track above as shown below:

Use Chroma Key to Remove Green Screen
Double click the green screen clip, and then tick Chroma Key option. By default, the green screen color will be picked and be removed automatically. You also can refine video by adjusting the offset, tolerance, edge thickness and edge feather settings to make background video clearer.

Preview PIP and Adjust
Check the result in the Preview window and adjust its size and positions if needed.
