> ## Documentation Index
> Fetch the complete documentation index at: https://comfytv.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Blur / Sharpen

> Softens or sharpens footage with a choice of blur kernels or an unsharp mask, in one ▶ Run.

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  <img src="https://mintcdn.com/comfytv/dMkMxJDZdIo4YzAU/images/nodes/_placeholder.svg?fit=max&auto=format&n=dMkMxJDZdIo4YzAU&q=85&s=b54171099e5b02d4313fe581171ebbcc" alt="Blur / Sharpen" width="800" height="450" data-path="images/nodes/_placeholder.svg" />
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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](https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md).

## 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.

## Parameters

### mode

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

### 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.

### 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.

### 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.

## Outputs

| Output    | Type            | Meaning                                     |
| --------- | --------------- | ------------------------------------------- |
| **video** | `COMFYTV_VIDEO` | The filtered clip as a new project snapshot |

## 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`.

## Related nodes

* **Video Denoise** — remove grain/noise rather than softening detail.
* **Video Stabilize / Stabilize Pro** — steady the camera before or after filtering.