AetherCut^™ green screen editor

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 does AetherCut remove a green screen background?

AetherCut converts each pixel from RGB to YCbCr, measures chroma distance from the keyed color, softens edge alpha, and runs spill suppression to remove green tint. Both passes run on the GPU for real time preview.

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 should I use Magic Mask instead of chroma key?

Use Magic Mask when the background is not a solid green or blue screen and you need to isolate a subject from a normal scene. It runs locally in AetherCut with no upload required.

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.

Can AetherCut replace a green screen background in real time?

Yes. After keying the subject, place another clip or image underneath on the timeline and AetherCut composites it in real time. You can export in 4K with no watermark, upload, or resolution paywall.

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.

How to get a cleaner key on the first try

The fastest way to make AetherCut’s green screen editor look good is to fix the shot before you touch the sliders. Uneven lighting, wrinkles in the backdrop, and green light bouncing onto skin all make the keyed color vary across the frame, which forces you to raise the threshold too far and starts eating into hair, fingers, or semi-transparent fabric. A better starting point is a flat, evenly lit screen with the subject pulled a few feet forward so less green spill reaches the edges of the face and shoulders. In practice, that usually means you can keep the threshold lower and let edge softness do the subtle work instead of using a harsh cutoff.

Inside the effect, sample the background with the eyedropper from an area near the subject rather than a random corner of the frame. Then increase threshold only until the background clears, and add just enough softness to stop jagged edges. If the subject starts looking thin or translucent, back the threshold down before compensating with spill suppression. That second pass is for removing green contamination, not for rescuing an over-aggressive matte. A good test is to scrub through a few frames with movement, especially hair and hands, because a key that looks perfect on a still frame often breaks once motion and blur show up.

A common edit is a talking-head clip composited over B-roll or a branded background plate. In that setup, slight imperfections that are invisible over black become obvious over bright graphics, so preview against the actual replacement layer early instead of keying in isolation. If the new background is darker than the original scene, you may also need a small color correction on the subject after the key so they do not look artificially bright or disconnected from the composite.