AetherCut™ green screen editor
Real-time chroma key on the GPU. Slider-tunable threshold and softness. Footage stays on your machine.
AetherCut's green-screen tool is a WebGL fragment shader that runs on your GPU. It samples each frame, computes the distance from your chosen key color in chroma space, and renders the result back to the canvas in real time. No frame is uploaded anywhere — verifiable in DevTools.
Because the shader runs on the GPU, playback stays smooth even on a 4K timeline. Adjustable sliders cover key color, threshold, edge softness, and spill suppression. You can chain Color Spill Suppression after the chroma key to clean up the green halo that always hugs hair and shoulders.
How AetherCut's chroma key works
The shader converts each pixel from RGB to YCbCr, then measures the chroma-plane distance from the keyed color. Pixels within your threshold become transparent. Pixels at the boundary get a softened alpha so the edge doesn't look like cutout-pixel-art.
Spill suppression is a separate pass that desaturates the keyed color in a halo around the masked subject — that's what kills the green tint on hair and shoulders without ghosting the subject.
Both passes run on the GPU. On a 2024 MacBook Air the 1080p shader sustains real-time playback comfortably. On older hardware the preview drops resolution adaptively but the export quality is unaffected.
When chroma key isn't the right tool
Chroma key works on solid-color backgrounds — typically green or blue. If you don't have a controlled background and you're trying to extract a subject from an arbitrary scene, Magic Mask (AetherCut's MediaPipe + MobileSAM Pro tool) is the better pick. It runs locally too, no upload.
If you have a green-screen plate but motion-blurred fast action (sports, dancing), every chroma key (browser or desktop) struggles. After Effects Keylight is still the gold standard for that case.
Pairing with background replacement
Once your subject is keyed, drop a clip beneath them on the timeline (a stock B-roll, a generated AI video, a still photo, or another shot you filmed). AetherCut renders the composite in real time. Export at 4K — no watermark, no upload, no resolution paywall.
Frequently asked questions
Is the green-screen tool free?
Yes. It's part of the Pro Visual FX shelf. The free tier includes the on-device background remover (no green screen needed) if you don't want to upgrade.
Does the chroma key work on blue screens too?
Yes. The key color is user-selectable — point the eyedropper at any color in the source frame.
Will I get the green-edge tint on my subject?
Without Color Spill Suppression, yes — that's universal to every chroma key. Run the Spill Suppression pass right after the chroma key and the tint goes away.
Try AetherCut now — no signup required.
Open the editor and verify the no-upload claim yourself in Chrome DevTools.
Free tier · Pro $14.95/mo · $129.88/yr · Lifetime Pro one-time
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