Dim-room flash with dark falloff

On-camera flash look: bright warm centre, deep falloff into dark edges, crushed contrast and grain. Party, night-out and candid clips that should look shot with a direct flash in a dark room.

Apply this to my video: "Dim-room flash with dark falloff" from the 24fps video editor library.
Preset JSON: https://24fps.dev/video-editor/effects/dim-room-flash-falloff-caf2/preset.json (pass its "preset" to the engine).
Engine (MIT, no dependencies, ES module): https://24fps.dev/editor/engine.js. Download the engine next to your page (curl -O) rather than importing cross-origin, then import { mount } from "./engine.js" in a <script type="module"> served over http.
Wiring: root = a position:relative box at the video's size. media = { main }: main is a wrapper holding my video, filling the root. Then const fx = mount(root, { kind: "effect", preset, media }) and call fx.render(seconds) every frame. It is seek-safe: drive it from the GSAP timeline in HyperFrames or call render(frame / fps) in Remotion. Before capturing frames, await (fx.ready ?? document.fonts.ready).
Field reference: https://24fps.dev/video-editor/llms.txt. Keep sizes as fractions of the frame height so it works at any resolution. Credit: 24fps.dev/video-editor

Same idea: Also called: Light Dimlit, Gloomy Flash, Flash Night
Technique: Recreated from a popular video editor's filter panel
Footage: Man talking and gesturing, Pexels

Similar effects & grades

Neon cyan outline on dimmed backgroundCut-out person rimmed with a thin cyan line and a pulsing cyan glow while the footage behind is dimmed almost to black.NeonOutlineCut-out

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Thin white line outlineA fine, even white line traced around the cut-out person with no glow.OutlineThinCut-out

Magenta aura, slow pulseSoft magenta glow breathing around the cut-out person against a slightly dimmed background.AuraGlowCut-out