> ## 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.

# Ideogram4Scheduler - ComfyUI Built-in Node Documentation

> Complete documentation for the Ideogram4Scheduler node in ComfyUI. Learn its inputs, outputs, parameters and usage.

# Ideogram 4 Scheduler

The Ideogram 4 Scheduler node generates a sequence of sigma values (noise levels) for the diffusion sampling process, based on the Ideogram 4 reference schedule. It creates a custom noise schedule that adapts to the image dimensions and allows fine-tuning through statistical parameters.

## Inputs

| Parameter | Description                                                                                                                | Data Type | Required | Range                      |
| --------- | -------------------------------------------------------------------------------------------------------------------------- | --------- | -------- | -------------------------- |
| `steps`   | The number of sampling steps to generate the schedule for (default: 20)                                                    | INT       | Yes      | 1 to 200                   |
| `width`   | The width of the image in pixels (default: 1024)                                                                           | INT       | Yes      | 256 to 8192 (step: 16)     |
| `height`  | The height of the image in pixels (default: 1024)                                                                          | INT       | Yes      | 256 to 8192 (step: 16)     |
| `mu`      | The mean parameter for the logit-normal distribution, controlling the central noise level (default: 0.0)                   | FLOAT     | Yes      | -10.0 to 10.0 (step: 0.05) |
| `std`     | The standard deviation parameter for the logit-normal distribution, controlling the spread of noise levels (default: 1.75) | FLOAT     | Yes      | 0.1 to 5.0 (step: 0.05)    |

## Outputs

| Output Name | Description                                                                                                                                                                                          | Data Type |
| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------- |
| `SIGMAS`    | A tensor of sigma values representing the noise schedule, with length equal to `steps + 1`. The values descend from high noise to low noise, with the final value set to 0.0 for complete denoising. | SIGMAS    |

> 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/Ideogram4Scheduler/en.md)

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