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

# SamplerLCMUpscale - ComfyUI Built-in Node Documentation

> This node provides a specialized sampling method that combines Latent Consistency Model (LCM) sampling with progressive image upscaling.

This node provides a specialized sampling method that combines Latent Consistency Model (LCM) sampling with progressive image upscaling. During sampling, the image is upscaled step by step toward a target scale ratio using a chosen interpolation method, allowing higher-resolution results in a single sampling pass. The node outputs a configured sampler object that can be connected to a sampling node.

## Inputs

| Parameter | Description | Data Type | Required | Range |
| - | - | - | - | - |
| `scale_ratio` | The total scaling factor to apply during upscaling. A value of 1.0 keeps the original resolution (default: 1.0) | FLOAT | Yes | 0.1 - 20.0 |
| `scale_steps` | The number of steps to use for the upscaling process. Use -1 for automatic calculation based on the sampling schedule (default: -1) | INT | Yes | -1 - 1000 |
| `upscale_method` | The interpolation method used for upscaling the image at each upscaling step (default: "bislerp") | COMBO | Yes | "bislerp"<br />"nearest-exact"<br />"bilinear"<br />"area"<br />"bicubic" |

`scale_ratio` and `scale_steps` are advanced parameters. The image is upscaled gradually from its original size to the target `scale_ratio` over the upscaling steps. When `scale_steps` is -1, the number of upscaling steps is calculated automatically as about half the number of sampling steps, with a minimum of 2; when a positive value is given, the node adjusts it internally and limits it based on the total number of sampling steps.

## Outputs

| Output Name | Description | Data Type |
| - | - | - |
| `sampler` | A configured sampler object that performs LCM sampling with progressive upscaling, ready to be used in the sampling pipeline | SAMPLER |

> 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/SamplerLCMUpscale/en.md)

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