docs: Lumenfall image provider tutorial

docs/features/media-generation/image-generation-and-editing/lumenfall.md

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+---
+sidebar_position: 7
+title: "Lumenfall"
+---
+
+:::warning
+This tutorial is a community contribution and is not supported by the Open WebUI team. It serves only as a demonstration on how to customize Open WebUI for your specific use case. Want to contribute? Check out the contributing tutorial.
+:::
+
+Open WebUI also supports image generation through [Lumenfall](https://lumenfall.ai), an AI media gateway that unifies all popular image models on many different providers into an OpenAI-compatible API. Free models are available.
+
+### Initial Setup
+
+1. Create a free account at [lumenfall.ai](https://lumenfall.ai).
+2. Generate an API key from your [dashboard](https://lumenfall.ai/app/api_keys).
+
+### Configuring Image Generation
+
+1. In Open WebUI, navigate to the **Admin Panel** > **Settings** > **Images** menu.
+2. Set the `Image Generation Engine` field to `Open AI` (Lumenfall uses the same syntax as OpenAI).
+3. Change the API endpoint URL to `https://api.lumenfall.ai/openai/v1`.
+4. Enter your Lumenfall API key.
+5. The API version can be left blank.
+6. Enter the model you wish to use. For example: `gemini-3-pro-image`, `gpt-image-1.5`, or `flux.2-max`. See all available models at [lumenfall.ai/models](https://lumenfall.ai/models).
+7. Set the image size (e.g. `1024x1024`). Supported sizes depend on the model - if unsure, `1024x1024` works with most models.
+
+![Screenshot of the Open WebUI Images settings page configured with Lumenfall.](/images/image-generation-and-editing/lumenfall-settings.png)
+
+### Configuring Image Editing
+
+Lumenfall also supports image editing through the same API:
+
+1. On the same **Images** settings page, scroll to the **Edit Image** section.
+2. Toggle **Image Edit** to on.
+3. Set the `Image Edit Engine` to `Open AI`.
+4. Enter the same API endpoint URL: `https://api.lumenfall.ai/openai/v1`.
+5. Enter your Lumenfall API key.
+6. Choose a model that supports editing (e.g. `gpt-image-1.5`).
+
+For more details, see the [Lumenfall documentation](https://docs.lumenfall.ai/integrations/openwebui).