> For the complete documentation index, see [llms.txt](https://sogni.gitbook.io/sogni-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sogni.gitbook.io/sogni-docs/sogni-studio/creating-images/generation-settings/context-editing-and-mixing/context-fill.md).

# Context-Fill

Use the lasso tool from the top toolbar to create a mask. A mask is an image with clear areas. When used with the Flux Kontext model, the generation process focuses on editing those areas based on your prompt. It's a powerful way to remove, add, or replace objects, modify the scene, and more.

1. Enable the lasso tool from the top toolbar.
2. Use the tool to clear an area, then click "Context-Fill". The masked image will be set a Kontext reference.

<figure><img src="/files/dCOh9O8jovbqtjXgEaxe" alt="" width="563"><figcaption><p>Use the lasso tool to clear an area, then click "Context-Fill"</p></figcaption></figure>

3. Enter a prompt like "Fill the empty area with..." and click "Imagine."

<figure><img src="/files/UuaCJ9usOfsuL4OmabfQ" alt="" width="563"><figcaption><p>Prompt: <strong>"Fill the empty area with a spaceship"</strong></p></figcaption></figure>

***

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