nano-banana
Generate images using Google's Nano-Banana (Gemini 2.5 Flash Image) model. Use when the user asks to generate, create, or make an image, picture, or illustration.
What this skill does
# Nano-Banana Image Generation Generate images using Google's Gemini Image models. ## IMPORTANT: Enhance User Prompts Before generating, **always enhance the user's prompt** using the techniques in [PROMPTING.md](PROMPTING.md). ### Quick Enhancement Formula `[Subject] + [Style] + [Lighting] + [Composition] + [Quality]` ### Example Enhancement - User says: "a cat" - Enhanced: "A fluffy orange tabby cat with bright green eyes, photorealistic, soft natural window lighting, shallow depth of field, rule of thirds composition" For detailed prompting techniques, templates, and style keywords, see [PROMPTING.md](PROMPTING.md). ## Quick Start ```bash ~/.claude/skills/nano-banana/scripts/generate.sh "your prompt here" ``` ## Options | Option | Description | Default | |--------|-------------|---------| | `--output PATH` | Save to specific file | `~/Pictures/nano-banana/<timestamp>.png` | | `--size SIZE` | Resolution: 1K, 2K, 4K | 1K | | `--aspect RATIO` | Aspect ratio | 1:1 | | `--flash` | Use Flash model (faster, lower quality) | Pro | ### Aspect Ratios `1:1`, `16:9`, `9:16`, `4:3`, `3:4`, `3:2`, `2:3` ### Resolutions - **1K** - Standard (default, fast) - **2K** - High resolution (requires Pro model) - **4K** - Maximum resolution (requires Pro model) ## Interpreting User Requests Parse the user's request and map to script options: | User says | Script call | |-----------|-------------| | "Generate a cat" | `generate.sh "a cat"` | | "Create a 4K image of mountains" | `generate.sh "mountains" --size 4K` | | "Make a landscape wallpaper" | `generate.sh "landscape" --aspect 16:9` | | "High quality portrait of a robot" | `generate.sh "portrait of a robot" --pro --aspect 3:4` | | "Generate a sunset, save to desktop" | `generate.sh "a sunset" --output ~/Desktop/sunset.png` | | "4K widescreen cyberpunk city" | `generate.sh "cyberpunk city" --size 4K --aspect 16:9` | ### Keywords to watch for: - **Resolution**: "4K", "high res", "high resolution", "2K", "large" → use `--size` - **Quality**: "high quality", "detailed", "professional" → use `--pro` - **Orientation**: "landscape", "widescreen", "wallpaper" → `--aspect 16:9` - **Orientation**: "portrait", "vertical", "phone wallpaper" → `--aspect 9:16` - **Save location**: "save to", "put it in", "output to" → `--output` ## Behavior - Runs in **background** (won't block Claude) - Sends **macOS notification** when complete - **Auto-opens** the image when done - Images saved to `~/Pictures/nano-banana/` by default ## Troubleshooting Check the error log: ```bash cat ~/.claude/skills/nano-banana/last-error.log ``` Verify API key: ```bash security find-generic-password -a "$USER" -s "GEMINI_API_KEY" -w | head -c 10 ```
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