> ## 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.

# RunwayTextToImageNode - ComfyUI Built-in Node Documentation

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

> 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/RunwayTextToImageNode/en.md)

The Runway Text to Image node generates images from text prompts using Runway's Gen 4 model. You can provide a text description and optionally include a reference image to guide the image generation process. The node handles the API communication and returns the generated image.

## Inputs

| Parameter         | Data Type | Required | Range                                                                                             | Description                                      |
| ----------------- | --------- | -------- | ------------------------------------------------------------------------------------------------- | ------------------------------------------------ |
| `prompt`          | STRING    | Yes      | -                                                                                                 | Text prompt for the generation (default: "")     |
| `ratio`           | COMBO     | Yes      | "16:9"<br />"1:1"<br />"21:9"<br />"2:3"<br />"3:2"<br />"4:5"<br />"5:4"<br />"9:16"<br />"9:21" | Aspect ratio for the generated image             |
| `reference_image` | IMAGE     | No       | -                                                                                                 | Optional reference image to guide the generation |

**Note:** The reference image must have dimensions not exceeding 7999x7999 pixels and an aspect ratio between 0.5 and 2.0. When a reference image is provided, it guides the image generation process.

## Outputs

| Output Name | Data Type | Description                                                               |
| ----------- | --------- | ------------------------------------------------------------------------- |
| `output`    | IMAGE     | The generated image based on the text prompt and optional reference image |