AI-Enhanced Image Generation with GPT-4.1: Auto-Expand Prompts to Google Drive & Slack

Short subject → AI-expanded image prompt → OpenAI image generation → Google Drive save → Slack notification

Who

Content operators or developers who need automated image generation in n8n with team distribution

You get

Turn a one-line subject into a high-quality AI image with cloud storage and instant notification

You need

n8n · slack · google-drive

Steps

1. Trigger the workflow

   Click 'Execute workflow' in the n8n editor to trigger manually, or replace with a Schedule/Webhook trigger. Data then flows into the 'Set image subject' node.

2. Set the image subject

   In the 'Set image subject' node (Edit Fields/Set node), set variable `subject` to your desired image theme. The template default is 'A monkey holding a banana in cartoon style'; replace with your actual subject.

3. AI expands the image prompt

   The 'Image Prompt' node (AI Agent, promptType=define) receives `{{ $json.subject }}` as input, calling the connected 'GPT 4.1' node (OpenRouter Chat Model, model='openai/gpt-4.1'). The systemMessage instructs the model to expand a simple concept into a professional image prompt covering subject, environment, art style, mood/lighting, and specific details.

   Execution prompt · Source text。Image Prompt node (AI Agent) Options > System Message field

   Copy prompt

   =
   You are a specialist in crafting high-quality image prompts. Your task is to take a simple concept and expand it into a fully detailed prompt suitable for text-to-image generation models.
   
   Prompt Requirements
   
   Your expanded prompt must explicitly cover:
   	1.	Primary Subject: The central figure, object, or scene.
   	2.	Environment/Setting: The surrounding context, location, or background activity.
   	3.	Art Style: The visual treatment (e.g., hyper-realistic, digital illustration, watercolor, anime, 3D render).
   	4.	Mood & Lighting: The emotional tone and lighting conditions (e.g., warm sunrise, dramatic shadows, neon glow).
   	5.	Specific Details: Any notable elements such as colors, textures, props, clothing, or defining features.
   
   Output Format
   	•	Start with a polished, coherent descriptive prompt that naturally incorporates all elements.
   	•	Write it as if instructing an AI to generate a professional, visually rich image.
   	•	Do not repeat the input phrase; reinterpret it as a vivid scene.
   	•	Use detailed, evocative language.
   
   Example
   
   Input: “A futuristic city”
   Output: “A vast nighttime metropolis illuminated by blue and purple neon. Sleek glass skyscrapers stretch into a misty sky while streams of flying vehicles weave between them. Crowded streets glow with holographic ads and pedestrians in advanced techwear. Digital-painting style, cinematic detail, moody atmosphere with neon reflections shimmering across wet pavement.”

4. Generate image

   The 'Generate Image' node (HTTP Request) sends a POST request to `https://api.openai.com/v1/images/generations`. The body includes model='gpt-image-1', prompt='={{ $json.output.replace(/"/g, '') }}' (the expanded prompt with quotes removed), and size='1024x1024'. Requires openAiApi credential.

5. Convert and save to Google Drive

   The 'Convert to File' node converts `data[0].b64_json` from the HTTP response to binary; the 'Save image to Drive' node (Google Drive) saves it as `={{ $('Set image subject').item.json.subject }}.png` to a specified Google Drive folder. Requires googleDriveOAuth2Api credential; replace folderId with your actual folder ID.

6. Slack notification

   The 'Send a message' node (Slack) sends a Block Kit message to the specified channel with image name, Google Drive preview link, and thumbnail. Requires slackApi credential; replace channelId with your actual channel ID.

You are an n8n workflow setup assistant. The user wants to replicate an AI-enhanced image generation template: input subject → GPT-4.1 expands prompt → OpenAI generates image → Google Drive storage → Slack notification. First confirm the user has an n8n instance ready, then check that these credentials are configured: OpenAI API, OpenRouter API, Google Drive OAuth2, Slack API. Then assist with importing the workflow JSON or building step-by-step.