nanobanana-skill
Generate or edit images using Google Gemini API via nanobanana. Use when the user asks to create, generate, edit images with nanobanana, or mentions image generation/editing tasks.
What this skill does
# Nanobanana Image Generation Skill
Generate or edit images using Google Gemini API through the nanobanana tool.
## Requirements
1. **GEMINI_API_KEY**: Must be configured in `~/.nanobanana.env` or `export GEMINI_API_KEY=<your-api-key>`
2. **Python3 with depedent packages installed**: google-genai, Pillow, python-dotenv. They could be installed via `python3 -m pip install -r ${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/requirements.txt` if not installed yet.
3. **Executable**: `${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/nanobanana.py`
## Instructions
### For image generation
1. Ask the user for:
- What they want to create (the prompt)
- Desired aspect ratio/size (optional, defaults to 9:16 portrait)
- Output filename (optional, auto-generates UUID if not specified)
- Model preference (optional, defaults to gemini-3-pro-image-preview)
- Resolution (optional, defaults to 1K)
2. Run the nanobanana script with appropriate parameters:
```bash
python3 ${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/nanobanana.py --prompt "description of image" --output "filename.png"
```
3. Show the user the saved image path when complete
### For image editing
1. Ask the user for:
- Input image file(s) to edit
- What changes they want (the prompt)
- Output filename (optional)
2. Run with input images:
```bash
python3 ${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/nanobanana.py --prompt "editing instructions" --input image1.png image2.png --output "edited.png"
```
## Available Options
### Aspect Ratios (--size)
- `1024x1024` (1:1) - Square
- `832x1248` (2:3) - Portrait
- `1248x832` (3:2) - Landscape
- `864x1184` (3:4) - Portrait
- `1184x864` (4:3) - Landscape
- `896x1152` (4:5) - Portrait
- `1152x896` (5:4) - Landscape
- `768x1344` (9:16) - Portrait (default)
- `1344x768` (16:9) - Landscape
- `1536x672` (21:9) - Ultra-wide
### Models (--model)
- `gemini-3-pro-image-preview` (default) - Higher quality
- `gemini-2.5-flash-image` - Faster generation
### Resolution (--resolution)
- `1K` (default)
- `2K`
- `4K`
## Examples
### Generate a simple image
```bash
python3 ${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/nanobanana.py --prompt "A serene mountain landscape at sunset with a lake"
```
### Generate with specific size and output
```bash
python3 ${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/nanobanana.py \
--prompt "Modern minimalist logo for a tech startup" \
--size 1024x1024 \
--output "logo.png"
```
### Generate landscape image with high resolution
```bash
python3 ${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/nanobanana.py \
--prompt "Futuristic cityscape with flying cars" \
--size 1344x768 \
--resolution 2K \
--output "cityscape.png"
```
### Edit existing images
```bash
python3 ${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/nanobanana.py \
--prompt "Add a rainbow in the sky" \
--input photo.png \
--output "photo-with-rainbow.png"
```
### Use faster model
```bash
python3 ${CLAUDE_PLUGIN_ROOT}/skills/nanobanana-skill/nanobanana.py \
--prompt "Quick sketch of a cat" \
--model gemini-2.5-flash-image \
--output "cat-sketch.png"
```
## Error Handling
If the script fails:
- Check that `GEMINI_API_KEY` is exported or set in ~/.nanobanana.env
- Verify input image files exist and are readable
- Ensure the output directory is writable
- If no image is generated, try making the prompt more specific about wanting an image
## Best Practices
1. Be descriptive in prompts - include style, mood, colors, composition
2. For logos/graphics, use square aspect ratio (1024x1024)
3. For social media posts, use 9:16 for stories or 1:1 for posts
4. For wallpapers, use 16:9 or 21:9
5. Start with 1K resolution for testing, upgrade to 2K/4K for final output
6. Use gemini-3-pro-image-preview for best quality, gemini-2.5-flash-image for speed
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