Nano Banana Pro (Gemini 3 Pro Image)#

Use the bundled script to generate or edit images.

Generate

bash

uv run {baseDir}/scripts/generate_image.py --prompt "your image description" --filename "output.png" --resolution 1K

Edit (single image)

bash

uv run {baseDir}/scripts/generate_image.py --prompt "edit instructions" --filename "output.png" -i "/path/in.png" --resolution 2K

Multi-image composition (up to 14 images)

bash

uv run {baseDir}/scripts/generate_image.py --prompt "combine these into one scene" --filename "output.png" -i img1.png -i img2.png -i img3.png

API key

• GEMINI_API_KEY env var (REQUIRED - get your key from https://aistudio.google.com/app/apikey)
• Or set skills."nano-banana-pro".apiKey / skills."nano-banana-pro".env.GEMINI_API_KEY in ~/.openclaw/openclaw.json

To set the API key:

1. Get your key from https://aistudio.google.com/app/apikey
2. Set it as an environment variable: export GEMINI_API_KEY="your-key-here"
3. Or add it to your OpenClaw config in ~/.openclaw/openclaw.json

Specific aspect ratio (optional)

bash

uv run {baseDir}/scripts/generate_image.py --prompt "portrait photo" --filename "output.png" --aspect-ratio 9:16

Notes

• Resolutions: 1K (default), 2K, 4K.
• Aspect ratios: 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9. Without --aspect-ratio / -a, the model picks freely - use this flag for avatars, profile pics, or consistent batch generation.
• Use timestamps in filenames: yyyy-mm-dd-hh-mm-ss-name.png.
• The script prints a MEDIA: line for OpenClaw to auto-attach on supported chat providers.
• Do not read the image back; report the saved path only.