Alpha channel generation that hands back the element
LTX generates a production-ready alpha matte alongside the shot itself, in the same pass. Hair, smoke, glass, and motion blur keep their soft edges, so the result can move straight into a comp without a separate keying step.
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Key capabilities
Partial transparency
Represent gradual transitions between the subject and background, keeping partially transparent areas available for natural blending.
Fine edge detail
Retain delicate features such as hair and the soft boundaries of smoke when separating elements for compositing.
Alpha matte generation
Every frame gets an opacity map: white fully visible, black fully transparent, everything between partial. Place a subject over a new background or blend smoke into a scene with soft transitions intact.
Full-resolution outputs
Alpha gen runs on generated footage and on real plates alike, and it inherits the 8K workflow, so it can run at 4K and 8K delivery resolution rather than being limited to a small test clip.
Professional file workflows
Your files go in and come back out in the format your pipeline already runs on. EXR in, EXR out, in the color space you declare, with the master intact.
Designed for real-world deployment
Production-grade alpha workflows for VFX, post-production, and content teams that need elements, not just frames.
Compositors separating subjects from plates, generated footage, and CG renders. The matte arrives with hair, smoke, and motion blur intact, so the element sits in the shot instead of announcing itself.
Finishing teams grading elements separately from their backgrounds. A soft matte holds up through a secondary, so you can push a subject without a halo appearing around it.
Lighting and rendering teams integrating live-action elements into 3D scenes. Get a matte with real partial transparency, not a hard outline that has to be fixed by hand.
Technical directors and pipeline developers moving elements between tools. Per-frame EXR with embedded alpha lands where your compositing applications already expect it.
How LTX Alpha Gen works
Input
Technical characteristics:
- Text prompt — Generate with alpha from scratch.
- Still image — Image-to-video with alpha.
- Existing footage — Video or an EXR frame sequence, in the color space you declare.
Output
Technical characteristics:
- Video plus alpha matte — A matching grayscale alpha matte.
- Per-frame EXR — Embedded alpha for compositing in Nuke, After Effects, or Resolve.
- Up to 8K — 4K and 8K delivery resolution via the 8K workflow.
- Source picture unchanged — The matte is additive, never a re-render of the frame.
What users are building with LTX
FAQs
What is an alpha matte in AI video generation?
An alpha matte is a per-frame opacity map that travels with the video: white where the subject is fully visible, black where it is fully transparent, and intermediate values for partially transparent areas such as hair, smoke, glass, and motion blur. It is what lets an element be composited over a new background instead of arriving locked to its original frame.
Can alpha be generated for existing footage, not just LTX-generated video?
Yes. Bring in a plate as video or as an EXR frame sequence and get a matte back. This is the common case in practice, since almost no existing plate was shot with a cut-out in mind.
What formats does the alpha come back in?
Per-frame EXR with embedded alpha, plus a grayscale matte, in the color space you declare on input. Files drop straight into Nuke, After Effects, or Resolve.
Does generating alpha change the picture?
No. The RGB frame is returned exactly as approved. The matte is generated alongside it, not by re-rendering the shot.
