Generate Ad Image Variations Using GPT-4, Dumpling AI & Google Drive

🧾 What this workflow does

This workflow takes a reference ad image and brand website, then uses GPT-4, LangChain, and Dumpling AI to generate 10 high-quality image variations for ad testing. These image variations are visually consistent but subtly different in background, mood, lighting, and tone — perfect for performance testing on platforms like Meta Ads or TikTok.

👤 Who is this for

DTC marketers and brand designers testing ad creatives
Creative teams automating visual experimentation
Content agencies using AI for fast ad mockups
Performance marketers running multivariate testing

⚙️ How to set up

✅ Requirements

You’ll need the following tools set up in n8n: Google Drive (OAuth2 credential) Google Sheets (OAuth2 credential) OpenAI API (for GPT-4 or GPT-4o) Dumpling AI API (via HTTP header authentication)

🛠️ Steps to configure

Google Sheet Setup
Create a sheet with one column: Image URL
Update the Sheet ID and tab name in the final Google Sheets node.

Drive Setup
Create a folder in Google Drive for storing the reference image.
Replace the folderId in the “Upload Ad Image to Google Drive” node.

Dumpling AI API Key
Use n8n’s credential manager (HTTP Header Auth) — do not hardcode the key.

OpenAI API Key
Required for both image description and LangChain agent prompt generation.

Form Inputs Required Brand Name
Brand Website
Ad Image (upload field)

🧠 How it works

A user submits the brand name, website, and a reference ad image through a form. The image is uploaded to Google Drive. GPT-4o describes the image’s visual style (e.g., mood, lighting, composition). GPT-4 analyzes the brand’s website to define its visual aesthetic. A LangChain agent uses both analyses to create 10 tightly scoped variation prompts. Dumpling AI generates a new image for each prompt using its “FLUX.1-pro” model. Each new image’s link is logged into Google Sheets.

🛠️ How to customize

🧪 Change prompt logic to experiment with different variations (e.g., theme, season). 🎨 Switch image model in Dumpling AI to one that supports your desired style. 🔗 Log additional metadata (prompt, timestamp) to Google Sheets. 📤 Connect output images to Airtable, Notion, or a review tool like Figma. 🎯 Modify GPT system message to reflect a different tone or brand strategy.

This workflow gives creative teams and marketers an instant, AI-powered ad image testing system — built on real brand visuals, not generic stock content.