How to add captions in your own colours with sparkle effects
Upload the clip and tell Vizard Agent the exact caption colours and the effect you want. Vizard Agent transcribes the speech to the millisecond, tests the caption style on a real frame, and compares several sparkle and light overlays composited over your footage before choosing one.
What do you type into Vizard Agent?
Name both colours, the text fill and the outline. Vizard Agent renders a style test before it commits, and a specific pair, such as yellow text with a lime green outline, gives it something exact to hit rather than an interpretation of a mood. "Bright" and "festive" produce a different result from a named pair.
Prompt
What does Vizard Agent actually do?
The middle of the session was debugging. The first sparkle overlay didn't blend correctly, and instead of trying another file Vizard Agent read its colour channels to find out why. An overlay that looks grey and flat over footage is usually a colour-space problem, not a bad effect. In the session behind this article it:
- Probed the clip, analysed the audio and vocal activity to find where the speech sat, and checked each spoken phrase's timing against frames of the speaker.
- Cleaned up and enhanced the voice, then re-transcribed the cleaned audio.
- Downloaded several sparkle and fairy-light elements, found the first one blending incorrectly over the footage, analysed its colour channels and corrected the blend in the right colour space.
- Compared four combinations on real frames: stars alone, stars with lights, lights with bokeh, and stars with gold dust.
- Rendered a style test for the exact colour pair, then the final 12.05-second video at the phone's own 1080x2460 and 23.81fps, plus a second version with the text only.
When does this not work well?
Captions depend on speech clear enough to transcribe, and overlays need visual room. Vizard Agent enhances the voice first, but there is a ceiling. Sparkles over a bright, detailed shot read as noise, strong colours can clash, and overlays cover the picture, so say if the subject's face must stay clear.
Common questions
Why does an overlay come out grey? Because of how it was encoded. Vizard Agent reads the effect's channels and composites it in the right colour space.
Can I get a version without the effect? Yes. Vizard Agent produced both on this run from the same work.
Does it keep my video's shape? Yes. Vizard Agent delivered this run at 1080x2460, exactly as the phone recorded it.