AI Agent: Line-Powered Lego Image Generator

Overview

Unleash AI-Powered Creativity with Your Line Bot. This n8n workflow acts as an AI Agent that listens for images sent via Line Messenger. When an image is received, it first uses an OpenAI GPT model (specifically gpt-4o-mini or a similar vision-capable model) to craft a DALL-E prompt designed to reinterpret the input image in an isometric Lego style. Then, it leverages DALL-E to generate this new Lego-fied image and sends it back to the user through Line. It's a fantastic way to add a playful, AI-driven image manipulation feature to your Line bot or service, automating creative content generation.

Key Features & Benefits

• AI Image Generation Ability: Transforms user-submitted images into unique Lego-style artwork using OpenAI's DALL-E.
• Intelligent Prompt Crafting Ability: Leverages an OpenAI GPT model to analyze the input image and dynamically generate an optimized DALL-E prompt for the Lego transformation. This AI Agent ability provides creative direction for consistent and high-quality outputs.
• Seamless Line Integration: Listens for images on Line, processes them, and replies with the Lego version directly in the chat, enhancing user interaction.
• Engage Your Audience: Offer a fun, interactive, and visually appealing feature for users on the Line platform, boosting engagement.
• Automated Visual Content: Ideal for B2C brands looking for novel marketing engagement or B2B SaaS for unique internal/external visual assets without manual design effort.

• An n8n instance (Cloud or self-hosted).
• OpenAI API Key with access to DALL-E and a GPT model with vision capabilities (e.g., gpt-4o-mini, gpt-4-vision-preview).
• Line Developer account with a Messaging API channel set up.
• Line Channel Access Token (Long-lived).

1. Download the n8n workflow JSON file.
2. Import the workflow into your n8n instance.
3. Configure the 'Receive a Line Webhook' node: Note the webhook URL provided by n8n (e.g., your-n8n-instance.com/webhook/lineimage). You'll need to set this URL in your Line Developer Console for your Messaging API channel's 'Webhook URL' setting.
4. In the 'Receive Line Messages' node, update the Authorization header with your Line Channel Access Token. Replace YOUR_LINE_BOT_TOKEN with your actual token (e.g., Bearer XyZ123...).
5. Configure the 'Creating a Prompt for Dall-E (Lego Style)' node: Select your OpenAI credential. Ensure the 'Model ID' is set to a vision-capable model like gpt-4o-mini.
6. Configure the 'Creating an Image using Dall-E' node: Select your OpenAI credential.
7. In the 'Send Back an Image through Line' node, update the Authorization header with your Line Channel Access Token. Replace YOUR_LINE_BOT_TOKEN with your actual token.
8. Ensure all placeholder credential IDs (e.g., YOUR_OPENAI_CREDENTIAL_ID in the credential fields of OpenAI nodes if not already set) are correctly configured to use your named n8n credentials for OpenAI.
9. Activate the workflow. Send an image to your Line bot via the Line app to test the transformation.