Generate and edit images using Google Gemini 3 Pro Image (Nano Banana Pro). Supports text-to-image, image editing, various aspect ratios, and high-resolution output (2K/4K). Use when user wants to generate images, create images, use Gemini image generation, or do AI image generation.

Nano Banana AI Image Generation Generate and edit images using Google's Gemini 3 Pro Image model ( gemini 3 pro image preview , nicknamed "Nano Banana Pro" 🍌). Prerequisites Required: GEMINI API KEY Get from [Google AI Studio](https://aistudio.google.com/apikey) Python 3.10+ with google genai package Install dependencies: Quick Start Generate an image: Edit an existing image: Generate with specific aspect ratio: Generate high resolution 4K image: Script Reference scripts/generate.py Main image generation script. Supported aspect ratios: 1:1 Square (default) 2:3 , 3:2 Portrait/Landscape 3:4 , 4:3 Standard 4:5 , 5:4 Photo 9:16 , 16:9 Widescreen 21:9 Ultra wide/Cinematic scripts/batch generate.py Generate multiple images with sequential naming. Example: Python API You can also use the module directly: Environment Variables Variable Description Default GEMINI API KEY Google Gemini API key Required IMAGE OUTPUT DIR Default output directory ./nanobanana images Features Text to Image Generation Create images from text descriptions. The model excels at: Photorealistic images Artistic styles (pixel art, illustration, etc.) Product photography Landscapes and scenes Image Editing Transform existing images with natural language: Style transfer Object addition/removal Background changes Color adjustments High Resolution Output Standard : Fast generation, good quality 2K : Enhanced detail (2048px) 4K : Maximum quality (3840px), best for text rendering Google Search Grounding Enable search for factually accurate images involving: Real people, places, landmarks Current events Specific products or brands Best Practices Prompt Writing Good prompts include: Subject description Style/aesthetic Lighting and mood Composition details Color palette Example: Batch Generation Tips 1. Generate 10 20 variations to explore options 2. Use consistent prompts for style coherence 3. Add 3 5 second delays to avoid rate limits 4. Review results and iterate on best candidates Rate Limits Gemini API has usage quotas Add delays between batch generations Check your quota at [Google AI Studio](https://aistudio.google.com/) Troubleshooting "API key not found" Set GEMINI API KEY environment variable Or pass via api key option "No image in response" Prompt may have triggered safety filters Try rephrasing to avoid sensitive content "Rate limit exceeded" Wait a few seconds and retry Reduce batch size or add longer delays References [references/prompts.md](./references/prompts.md) Prompt examples by category [examples/](./examples/) Example usage scripts