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Regrain

Regrain · screenshot coming soon

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What this node does

Regrain overlays synthetic film grain onto a clip. Unlike a flat noise pass, you set how much grain lands in the shadows, midtones, and highlights independently, plus its size and color saturation — mirroring how real film grain varies across the tonal range. This is the tool for a convincing organic film texture. This is a rendered stage — it needs a ▶ Run (torch/GPU backend). In goes COMFYTV_VIDEO, out comes COMFYTV_VIDEO. If all three tonal amounts (shadows, midtones, highlights) are zero, the node passes the clip through unchanged (no grain to add). To hand the result to a native ComfyUI node, insert a Bridge. See bridges.md.

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When to use it

  • Add organic film grain to a clean AI/CG render so it blends with real footage.
  • Match the grain character of a specific film stock.
  • Restore grain after denoising or upscaling flattened it out.

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Parameters

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grain_size

0.0–4.0 (step 0.05), default 0.8. Size of the grain particles. Smaller = fine, tight grain; larger = coarse, chunky grain.

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shadows

0.0–1.0, default 0.3. Amount of grain in the darkest tones.

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midtones

0.0–1.0, default 0.15. Amount of grain in the mid tones.

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highlights

0.0–1.0, default 0.05. Amount of grain in the brightest tones. (Real film usually shows the least grain in highlights, hence the low default.)

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grain_sat

0.0–1.0, default 0.4. Color saturation of the grain. 0.0 is monochrome (luma-only) grain; higher adds colored grain.

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seed

0–99999, default 7. Random seed for the grain pattern. Change it for a different grain distribution; keep it fixed for a repeatable result.

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Outputs

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Tips

  • Follow the film convention: most grain in shadows, less in midtones, least in highlights (the defaults already do this).
  • Keep grain_sat low for a classic monochrome film-grain feel; raise it only if you want visible color noise.
  • Set all three tonal amounts to 0 and the node does nothing (identity pass-through).
  • Old Film — full film-damage simulation (grain plus scratches, flicker, weave).
  • Video Stylize — includes a simpler grain preset.