> ## Documentation Index
> Fetch the complete documentation index at: https://dripart-mintlify-b90d3c69.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# FreeU - ComfyUI Built-in Node Documentation

> Complete documentation for the FreeU node in ComfyUI. Learn its inputs, outputs, parameters and usage.

The FreeU node applies frequency-domain modifications to a model's output blocks to enhance image generation quality. It works by scaling different channel groups and applying Fourier filtering to specific feature maps, allowing for fine-tuned control over the model's behavior during the generation process.

## Inputs

| Parameter | Description                                                                    | Data Type | Required | Range      |
| --------- | ------------------------------------------------------------------------------ | --------- | -------- | ---------- |
| `model`   | The model to apply FreeU modifications to                                      | MODEL     | Yes      | -          |
| `b1`      | Backbone scaling factor for model\_channels × 4 features (default: 1.1)        | FLOAT     | Yes      | 0.0 - 10.0 |
| `b2`      | Backbone scaling factor for model\_channels × 2 features (default: 1.2)        | FLOAT     | Yes      | 0.0 - 10.0 |
| `s1`      | Skip connection scaling factor for model\_channels × 4 features (default: 0.9) | FLOAT     | Yes      | 0.0 - 10.0 |
| `s2`      | Skip connection scaling factor for model\_channels × 2 features (default: 0.2) | FLOAT     | Yes      | 0.0 - 10.0 |

## Outputs

| Output Name | Description                                   | Data Type |
| ----------- | --------------------------------------------- | --------- |
| `model`     | The modified model with FreeU patches applied | MODEL     |

> This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! [Edit on GitHub](https://github.com/Comfy-Org/embedded-docs/blob/main/comfyui_embedded_docs/docs/FreeU/en.md)

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