# Nano Banana Pro (Google Gemini Image)

The GeminiImage2Node generates or edits images using Google's Vertex AI Gemini model. It sends a text prompt and optional reference images or files to the API and returns the generated image and/or a text description.

## Inputs

| Parameter | Description | Data Type | Required | Range |
|-----------|-------------|-----------|----------|-------|
| `prompt` | Text prompt describing the image to generate or the edits to apply. Include any constraints, styles, or details the model should follow. | STRING | Yes | N/A |
| `model` | The specific Gemini model to use for generation. The "Nano Banana 2" option maps to the `gemini-3.1-flash-image-preview` model internally. | COMBO | Yes | `"gemini-3-pro-image-preview"`<br>`"Nano Banana 2 (Gemini 3.1 Flash Image)"` |
| `seed` | When fixed to a specific value, the model makes a best effort to provide the same response for repeated requests. Deterministic output isn't guaranteed. Changing the model or other settings can cause variations even with the same seed. Default: 42. | INT | Yes | 0 to 18446744073709551615 |
| `aspect_ratio` | The desired aspect ratio for the output image. If set to 'auto', it matches your input image's aspect ratio; if no image is provided, a 16:9 square is usually generated. Default: "auto". | COMBO | Yes | `"auto"`<br>`"1:1"`<br>`"2:3"`<br>`"3:2"`<br>`"3:4"`<br>`"4:3"`<br>`"4:5"`<br>`"5:4"`<br>`"9:16"`<br>`"16:9"`<br>`"21:9"` |
| `resolution` | Target output resolution. For 2K/4K the native Gemini upscaler is used. | COMBO | Yes | `"1K"`<br>`"2K"`<br>`"4K"` |
| `response_modalities` | Choose 'IMAGE' for image-only output, or 'IMAGE+TEXT' to return both the generated image and a text response. | COMBO | Yes | `"IMAGE+TEXT"`<br>`"IMAGE"` |
| `images` | Optional reference image(s). To include multiple images, use the Batch Images node (up to 14). | IMAGE | No | N/A |
| `files` | Optional file(s) to use as context for the model. Accepts inputs from the Gemini Generate Content Input Files node. | CUSTOM | No | N/A |
| `system_prompt` | Foundational instructions that dictate an AI's behavior. Default: A pre-defined system prompt for image generation. | STRING | No | N/A |

**Constraints:**

* The `images` input supports a maximum of 14 images. If more are provided, an error will be raised.
* The `files` input must be connected to a node that outputs the `GEMINI_INPUT_FILES` data type.

## Outputs

| Output Name | Description | Data Type |
|-------------|-------------|-----------|
| `image` | The image generated or edited by the Gemini model. | IMAGE |
| `string` | The text response from the model. This output will be empty if `response_modalities` is set to "IMAGE". | STRING |

> 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/GeminiImage2Node/en.md)

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