SKILL.md

name: nanobanana description: Use when "nanobanana", "generate image", "create image", "edit image", "AI drawing", "Gemini image", "image generation" version: 1.0.0

Nanobanana Image Generation

Generate and edit images using Google Gemini API.

Prerequisites

Requirement	Setup
API Key	Export `GEMINI_API_KEY` or add to `~/.nanobanana.env`
Dependencies	`pip install google-genai Pillow python-dotenv`
Script	`${CLAUDE_PLUGIN_ROOT}/skills/core/nanobanana/nanobanana.py`

Basic Usage

Task	Command
Generate image	`python3 nanobanana.py --prompt "description" --output "file.png"`
Edit image	`python3 nanobanana.py --prompt "changes" --input source.png --output "edited.png"`

Aspect Ratios

Size	Ratio	Use Case
`1024x1024`	1:1	Square, logos
`768x1344`	9:16	Portrait, stories (default)
`1344x768`	16:9	Landscape, wallpapers
`832x1248`	2:3	Portrait photos
`1248x832`	3:2	Landscape photos
`1536x672`	21:9	Ultra-wide

Use --size WIDTHxHEIGHT to specify.

Models

Model	Trade-off
`gemini-3-pro-image-preview`	Higher quality (default)
`gemini-2.5-flash-image`	Faster generation

Use --model MODEL to specify.

Resolution

Resolution	Use Case
`1K`	Testing, drafts (default)
`2K`	Good quality
`4K`	Final output, print

Use --resolution RES to specify.

Best Practices

Practice	Why
Be descriptive	Include style, mood, colors, composition
Use 1:1 for logos	Clean square format
Use 9:16 for stories	Standard mobile format
Use 16:9 for wallpapers	Standard widescreen
Start with 1K	Test before using higher resolution
Use flash model for iteration	Save time during drafting

Examples

Generate landscape:

python3 nanobanana.py --prompt "Mountain sunset with lake" --size 1344x768 --output "landscape.png"

Generate logo:

python3 nanobanana.py --prompt "Minimalist tech logo" --size 1024x1024 --output "logo.png"

Edit existing image:

python3 nanobanana.py --prompt "Add rainbow to sky" --input photo.png --output "edited.png"

High quality output:

python3 nanobanana.py --prompt "Professional portrait" --resolution 2K --output "portrait.png"

Troubleshooting

Issue	Solution
Script fails	Check `GEMINI_API_KEY` is set
No image generated	Make prompt more specific
Can't read input	Verify file exists and is readable
Can't write output	Check directory is writable

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