# Outpainting

**Source:** https://promtable.com/glossary/outpainting

> Outpainting generates new, coherent image content beyond the original canvas edges, extending a picture outward.

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Outpainting generates new, coherent image content beyond the original canvas edges, extending a picture outward.

Outpainting (also "uncropping") extends an image past its original borders, letting a diffusion model invent plausible surroundings that match the existing lighting, perspective, and style. The model treats the new area as a masked region conditioned on the visible pixels plus your prompt, then fills it so seams disappear. It is the complement of inpainting, which edits inside the frame. Outpainting is used to change aspect ratio (turn a square into a 16:9 banner), reveal more of a scene, or rebuild a tight crop into a full composition. Best results come from extending in modest steps rather than one huge jump.

## When to use

- Reframing a portrait or product shot to a wider or taller aspect ratio.
- Adding headroom or background for text overlays and ad placements.
- Recovering a scene that was cropped too tightly.

## When not to use

- When you need the new area to match a real, specific place — the model invents, it does not recall.
- Extremely large extensions in one pass; expand in stages to keep coherence.

## Example

```
Input: Square 1:1 product photo + outpaint left/right to 16:9, prompt: "same studio backdrop, soft gradient"
Output: A widescreen banner where the backdrop continues seamlessly on both sides of the product.
```

## Common mistakes

- Outpainting a huge area at once, producing repeated or warped content.
- Leaving the prompt empty — describe what should be in the new region.
- Forgetting to blend the seam; a small overlap mask hides the join.

## Related terms

- [denoising-strength](https://promtable.com/glossary/denoising-strength)
- [seed](https://promtable.com/glossary/seed)
- [cfg-scale](https://promtable.com/glossary/cfg-scale)
- [negative-prompt](https://promtable.com/glossary/negative-prompt)
- [diffusion-model](https://promtable.com/glossary/diffusion-model)

## Sources

- [Hugging Face Diffusers — inpaint & outpaint](https://huggingface.co/docs/diffusers/using-diffusers/inpaint)

*Last updated: 2026-06-02*
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Original page: https://promtable.com/glossary/outpainting
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