Redesign T-Shirt Mockups to Print-Ready Files with GPT-4 Vision & Imagen 4

🧠 What This Workflow Does This n8n workflow allows you to upload a T-shirt mockup design (even if it's rough or outdated), and automatically turns it into a refined, print-ready artwork using the power of AI. It starts with an image of a T-shirt design, analyzes it using OpenAI's vision model, and then generates a cleaner, upgraded prompt to be used with OpenAI’s image generation API (gpt-image-1). The final output is a new T-shirt graphic optimized for printing on solid black background, with no visible shirt or mockup framing. ⚙️ How It Works User Sends a T-shirt Mockup Image Link The workflow begins when the user drops an image link (T-shirt mockup) into a chat interface or input trigger

Help me set up the n8n workflow "Redesign T-Shirt Mockups to Print-Ready Files with GPT-4 Vision & Imagen 4" (https://n8n.io/workflows/3959). It uses: HTTP Request, Code, AI Agent, OpenAI Chat Model, OpenAI. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.