# Technic of chromakey

**URL:** <https://forum.8thwall.com/t/technic-of-chromakey/5583>\
**Category:** Technical Support\
**Created:** [March 14, 2025, 2:56am UTC](https://forum.8thwall.com/t/technic-of-chromakey/5583 "2025-03-14T02:56:00Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![kosuke\_yanagi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.8thwall.com/kosuke_yanagi/32/1606_2.png) [@kosuke\_yanagi](https://forum.8thwall.com/u/kosuke_yanagi)\
**Post date:** [March 14, 2025, 2:56am UTC](https://forum.8thwall.com/t/technic-of-chromakey/5583/1 "2025-03-14T02:56:00Z")

</div>

I created a 2D shape animation in After Effects and added a **00FF00** background for chroma keying in 8th Wall. However, upon checking the output, I noticed a faint spill still remaining.

How should I address this issue? Does the video’s Mbps affect it?

---

<div class="post-metadata">

**Author:** ![GeorgeButler](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.8thwall.com/georgebutler/32/1903_2.png) [@GeorgeButler](https://forum.8thwall.com/u/GeorgeButler)\
**Post date:** [March 17, 2025, 3:38pm UTC](https://forum.8thwall.com/t/technic-of-chromakey/5583/2 "2025-03-17T15:38:50Z")

</div>

Which sample project are you using, if any? There should be configurable parameters for the spill values. For example see the README here: [Studio: Chromakey Video | 8th Wall | 8th Wall](https://www.8thwall.com/8thwall/chromakey). In general though, yes the compression on the video can affect how it appears.