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Light Graffiti

Light Graffiti · screenshot coming soon

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What this node does

Light Graffiti accumulates the brightest parts of a COMFYTV_VIDEO over time, so moving light sources (sparklers, phone screens, headlights) smear into persistent glowing streaks, like a long-exposure light-painting photograph. It writes a new snapshot on ▶ Run. In and out are both COMFYTV_VIDEO. To feed native ComfyUI nodes, insert a Bridge — see the bridge guide.

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When to use it

  • Turn a sparkler, flashlight, or LED wand into drawn strokes of light.
  • Build up neon-trail visuals from moving highlights in a night shot.
  • Emulate a long-exposure light-painting effect from ordinary video.

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Parameters

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threshold

Per-channel brightness above which a pixel counts as “light,” 0.5–1.0 (step 0.005), default 0.9. Lower catches dimmer highlights; higher keeps only the brightest points.

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sum_threshold

Combined R+G+B brightness gate, 0.0–3.0 (step 0.05), default 2.2. A second, total-brightness test so only genuinely bright (not just one hot channel) pixels paint.

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decay

How fast the accumulated trail fades over time, 0.0–1.0 (step 0.005), default 0.0. At 0 trails persist for the whole clip; raise it to make streaks fade behind the moving light.

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gain

Brightness boost applied to the accumulated trails, 0.1–4.0 (step 0.05), default 1.0. Higher makes the light-painting glow more intense.

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Outputs

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Tips

  • If nothing is trailing, lower threshold and/or sum_threshold so more pixels qualify as light.
  • Keep decay at 0 for permanent strokes; add a little to let older trails dim behind the source.
  • Feedback FX — recursive echo/vertigo trails driven by feedback mixing.
  • Strobe — punctuate the light with interval flashes.