How to turn a video's captions into a reusable green-screen layer
Ask Vizard Agent for a green-screen version containing only the text already on the video, and say whether the original letterforms matter. There are two ways to do it: isolate the real pixels, or retype the words in a new font. They give very different results from the same request.
What do you type into Vizard Agent?
Say which of the two versions you want, or ask to see both. Left unspecified, a request for the text on green is ambiguous, and the version that keys most cleanly is also the one that has quietly replaced the design you were trying to reuse. Vizard Agent keeps the audio by default.
Prompt
What does Vizard Agent actually do?
A rebuilt caption keys beautifully and isn't the same object. Isolating the real strokes keeps the typeface but brings a little background with it, so Vizard Agent tests the mask both ways: tighten it and the thin parts of letters go, loosen it and the strokes come back with a halo. In the session behind this article it:
- Extracted frames to identify each text layer, built a short green-screen sample with a channel mask, and checked it for green purity and leftover background.
- Surveyed every text cue in the video so background detail wasn't kept by mistake, then narrowed the mask to the central text region and the watermark strip.
- Read the text and its timings and exported a clean green screen with regenerated text layers, resizing the white text and separating the coloured layers so they stopped overlapping.
- Switched approach, because the rebuild was clean but set in a typeface nobody asked for, and isolated the original strokes directly onto the green.
- Tested a narrower mask, widened it again when it ate parts of the letters, and delivered the version that kept the most original text pixels, with the audio intact.
When does this not work well?
Some text can't be lifted off its background. Letters over a busy scene, semi-transparent captions and text with a soft shadow or glow share their edge pixels with the picture behind them, and no key separates those cleanly. There the honest route is rebuilding the captions. Thin or script typefaces lose strokes first when the mask tightens.
Common questions
Is a rebuild ever better? Yes, when the original text is low resolution or badly compressed.
Can I get a transparent WebM? Yes. Ask Vizard Agent for one and green spill stops being a concern.
Will the timing match the original? Yes. Vizard Agent keeps each line appearing and disappearing exactly where it did.