image-gen
Generate or edit images via Google Gemini (nano-banana-pro) or OpenAI gpt-image-2. Trigger on "generate image", "create diagram", "edit image", or "make illustration". Supports 1K/2K/4K resolution, masked inpainting, and text-accurate generation.
What this skill does
# Image Generation & Editing
Multi-provider image generation. Default provider is Gemini (nano-banana-pro); pass `--provider openai` to use gpt-image-2.
## Which provider to pick
- **Gemini (default):** general illustrations, quick diagrams, visual imagery.
- **OpenAI:** anything where text rendering matters (infographics, slide-like images, dense-label diagrams, logos with text) or when you need masked inpainting on edits.
## Usage
The skill ships a pre-bundled Node script — no tsx or dependency install required on the user side. Invoke with `node`. Run `node ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js --help` at any time for the full flag reference printed by the script itself.
**Generate:**
```
node ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js \
--prompt "your description" --filename "output.png" \
[--provider gemini|openai] [--resolution 1K|2K|4K] [--size WxH] [--quality low|medium|high|auto] [--api-key KEY]
```
**Edit (image-to-image):**
node ${CLAUDE_PLUGIN_ROOT}/skills/image-gen/dist/generate_image.js \
--prompt "editing instructions" --filename "output.png" \
--input-image "path/to/input.png" [--mask "path/to/mask.png"]
```
## Flag reference
| Flag | Values | Notes |
|------|--------|-------|
| `--prompt` | text | Required. |
| `--filename` | path | Required. Output PNG. |
| `--provider` | `gemini` \| `openai` | Default: `gemini` (or `openai` if only `OPENAI_API_KEY` is set). |
| `--resolution` | `1K` \| `2K` \| `4K` | Default `1K`. `4K` clamps to `3840x2160` on OpenAI. |
| `--size` | `WxH` | OpenAI only. Overrides `--resolution`. Max edge 3840, multiples of 16. |
| `--quality` | `low` \| `medium` \| `high` \| `auto` | OpenAI only. Default `auto`. Ignored on Gemini. |
| `--input-image` | path | Switches to edit mode. Repeatable on Gemini for multi-image composition; OpenAI accepts only one. |
| `--mask` | path | OpenAI only. Inpainting mask. Requires `--input-image`. |
| `--api-key` | key | Overrides env for selected provider. |
| `-h`, `--help` | — | Print CLI help and exit. |
## Resolution
- `1K` (default) — 1024px
- `2K` — 2048px
- `4K` — 4096px on Gemini; silently clamped to `3840x2160` on OpenAI (OpenAI's hard cap is 3840).
- `--size WxH` (OpenAI only) overrides `--resolution`. Max edge 3840, both edges must be multiples of 16.
## Quality (OpenAI only)
`low | medium | high | auto` (default `auto`). Ignored on Gemini with a warning.
## Masks (OpenAI only)
`--mask <path>` enables inpainting. Requires `--input-image`. Error if used with Gemini.
## API keys
Resolution order:
1. `--api-key` flag (applied to selected provider)
2. Provider-specific env:
- Gemini: `GEMINI_API_KEY` or `GOOGLE_API_KEY`
- OpenAI: `OPENAI_API_KEY`
## Filename convention
```
`YYYY-MM-DD-HH-MM-SS-descriptive-name.png`
## For blog diagrams
Use OpenAI at `2K` for anything with readable labels or callouts. Save to the appropriate content dir (e.g., `src/content/blog/post-name/`). Prefer clean, minimalist styles.
## Output
- Saves PNG to the specified path.
- Script prints the full saved path.
- Do not read the image back — inform the user of the path.
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