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Blur / Sharpen

Blur / Sharpen · screenshot coming soon

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What this node does

Blur / Sharpen applies one of four spatial filters to a whole COMFYTV_VIDEO clip: a Gaussian blur, a fast box blur, an edge-preserving bilateral blur, or an unsharp-mask sharpen. It runs through ffmpeg on ▶ Run and writes a new video snapshot; the input clip is unchanged. 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

  • Knock down noise or diffuse a background with a soft Gaussian or box blur.
  • Blur while keeping edges crisp (skin, product outlines) with the bilateral mode.
  • Add bite back to slightly soft footage with the sharpen mode before export.

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Parameters

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mode

Which filter to run. Options: gaussian (smooth blur), box (fast average blur), bilateral (edge-preserving blur), sharpen (unsharp mask). Default gaussian.

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amount

The main strength dial, 0.0–20.0, default 2.0. Its meaning depends on mode: it is the Gaussian sigma, the box kernel size, the bilateral spatial sigma, or (for sharpen, clamped internally to 0–5) the unsharp amount. For gaussian and sharpen it must be above 0. Start around 2.0 and adjust to taste.

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size

Odd kernel size, 3–13, default 5. Only used by the sharpen mode (the unsharp luma matrix); larger sizes sharpen coarser detail. Even values are nudged to the next odd number.

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edge_preserve

Bilateral color sigma (sigmaR), 0.01–1.0, default 0.1. Only used by the bilateral mode. Lower values keep edges harder (less color bleed across contrast); higher values blur more freely.

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Outputs

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Tips

  • size and edge_preserve only do something in their respective modes (sharpen, bilateral); changing them in other modes has no effect.
  • box reads amount as a pixel kernel size, so it climbs in strength differently from gaussian.
  • Video Denoise — remove grain/noise rather than softening detail.
  • Video Stabilize / Stabilize Pro — steady the camera before or after filtering.