Luma key.
Make dark or bright regions transparent using an adjustable brightness threshold.
Try it in your agent.
Use this prompt as a starting point. Review the result, then ask for the details you want to change.
A prompt to start from
Use Strata. Create an eight-second Strata luminance-key demonstration. On the right, place a white circular light on an opaque Charcoal rectangular source plate, over a Sea and Sky striped backdrop. Animate actual Luma Key threshold to remove the dark source pixels while retaining the white light. The revealed stripes must be independent layers showing through genuine keyed transparency. Keep the Exposure title on Bone to the left.
A few useful details.
How do I try this with my agent?
Copy the prompt into your supported local agent with Strata installed. Review the preview, then ask for the changes you want. The composition stays editable as you refine it.
Where does the video render?
Strata previews and renders locally on an Apple Silicon Mac. The local engine is free; your agent’s subscription or usage costs are separate.
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