# Polish

> Slow motion, upscaling, denoising — the finishing layer.
> Part of the Cuts Guide (en) — https://ferment.run/cuts/docs (Markdown map: https://ferment.run/cuts/docs/index.md)
> Canonical page: https://ferment.run/cuts/docs/polish

Three enhancements, all AI, all run per clip:

- **Slow motion** — up to 8×, motion-aware, with motion blur.
- **Upscale** — sharpen and enlarge, up to 4K.
- **Video denoise** — clean up grainy low-light footage.

The on-device versions need a recent iPhone and cost a few credits each, on every plan, with the cost shown in the app. Heavier upscales run in the cloud on paid plans — priced by clip length with a five-second minimum, quoted before they run; [Your library](/cuts/docs/your-library) explains how cloud jobs get your footage. (Audio cleanup is different: speech denoising and loudness leveling are included, always. See [Speech & captions](/cuts/docs/speech-and-captions).)

## How it works

Pick a clip and choose an enhancement from its **Variants**, or just ask in chat — "slow this one down" does the same thing. The result arrives as a variant next to the original: audition it, commit or step back, as in [The basics](/cuts/docs/the-basics). The original never disappears.


## When to polish

Enhancement is the last pass, not the first. Cut the piece, place the music, set the captions — then slow the moment that needs it.