Tutorial

Replace a video background without opening a compositor

Person replace combines AI cutout with a new plate in one local step — solid, still, or video backgrounds — when you do not need a full After Effects graph.

August 21, 20265 mintutorial, AI Smart Cutout, compositing

The short answer

AI Smart Cutout gives you an alpha for someone else's timeline. AI Person Replace goes one step further: matte plus a new background (solid, image, or video) and export the composite. No green screen. No media upload. Preview after download; export on pricing.

Current KwaFlux Person Matting workspace with a demo portrait split — layout screenshot, not a claimed composite — Current desktop screenshot. Preview uses an existing demo still for layout — not a claimed live replace.

When person replace beats a separate compositor

Talking-head social, course intros, a branded solid or still plate
You do not want to bounce through After Effects for a simple swap
Same local GPU as enhance — one app from isolate to deliver

When to stay in After Effects

Multi-layer VFX, tracked cameras, or heavy edge work
You need the alpha in ProRes 4444 or a PNG sequence for a compositor
Subject matches the background color or hair is extremely fine — preview the matte first

How to replace the plate

Import the clip and pick a replacement plate — solid, still, or video
Preview edges on hair and fingers at native resolution
Export the composite, or export a matte if you still need a compositor

Experience on Your Own Footage

Download KwaFlux locally and render 1s, 3s, and 5s previews before you pay — 100% on your GPU without cloud upload.

Try KwaFlux free Explore features

Frequently asked questions

What is person replace?

It isolates the subject and composites a new background in one local pass — a shortcut when you do not need a full compositing graph.

Do I still need a green screen?

No. Quality depends on contrast and lighting, the same as any AI matte. Preview edges before a full export.

Can I try it before buying?

Yes. Download KwaFlux and render 1-, 3-, and 5-second effect previews across all AI modules without creating an account. You only sign in and pick a paid plan when you want to export or convert, and there is a $199.99 Perpetual License if you prefer to skip subscriptions.

Is my footage uploaded to the cloud?

No. The AI processing runs on your own GPU and your media files are not uploaded — there is no queue and no per-minute cloud fee. The network is used only for sign-in and license checks (needed to export on a paid plan) and for updates.

How many devices can I use?

Each license can be used on up to 2 devices. Sign in on a new device to activate it; if you are already at the limit, the least recently used device may be signed out automatically. You can also revoke devices from your dashboard at any time.

What are the pricing options?

The Perpetual License is $199.99 one-time. Subscriptions are also available at $29.99/month, $49.99/quarter, and $79.99/year. All plans include the full local desktop feature set.