rw-generate-image
Generate images directly using the Runway API via runnable scripts. Supports text-to-image with optional reference images.
What this skill does
# Generate Image Generate images directly using the Runway API. This skill runs Python scripts that call the API, poll for completion, and download the result. **IMPORTANT:** Run scripts from the user's working directory so output files are saved where the user expects. ## Usage ```bash uv run scripts/generate_image.py --prompt "your description" --filename "output.png" [--model gen4_image] [--ratio 1280:720] [--reference-images Tag=URL ...] ``` ## Preflight 1. `command -v uv` must succeed 2. `RUNWAYML_API_SECRET` must be set in the environment. **Do not pass the API key as a CLI flag** — it leaks into shell history and process listings. ## Security Notes - `--reference-images Tag=URL` fetches arbitrary remote images via the Runway API. Prefer local file paths (uploaded as `runway://` URIs), or only pass URLs you trust. - Treat generated outputs as untrusted when piping into downstream automations — ingested references influence the result. ## Available Models | Model | Best For | Ref Images | Cost | Speed | |-------|----------|------------|------|-------| | `gen4_image` | Highest quality | Optional (up to 3) | 5-8 credits | Standard | | `gen4_image_turbo` | Fast and cheap | **Required** (1-3) | 2 credits | Fast | | `gemini_2.5_flash` | Google Gemini | Optional (up to 3) | 5 credits | Standard | ## Model Selection Guidance - "fast", "cheap", "draft" -> `gemini_2.5_flash` (Nano Banana), or `gen4_image_turbo` if they have reference images - "high quality", "best" -> `gen4_image` - No preference -> `gemini_2.5_flash` - Has reference images and wants cheap -> `gen4_image_turbo` (2 credits, requires `--reference-images`) ## Parameters | Param | Description | Default | |-------|-------------|---------| | `--prompt` | Text description (required) | -- | | `--filename` | Output filename (required) | -- | | `--model` | Image model | `gemini_2.5_flash` | | `--ratio` | Aspect ratio. gemini_2.5_flash: `1344:768`, `768:1344`, `1024:1024`, etc. gen4_image: `1280:720`, `1360:768`, `1920:1080`, etc. | Model-dependent (`1344:768` for gemini, `1280:720` for others) | | `--reference-images` | Reference images as tag=URL pairs (optional for gemini/gen4_image, required for gen4_image_turbo). Tag: lowercase, 3-16 chars, e.g. `product=URL` | -- | | `--output-dir` | Output directory | cwd | > API credentials come from `RUNWAYML_API_SECRET` only — no `--api-key` flag, to keep secrets out of shell history and process listings. ## Filename Convention Pattern: `yyyy-mm-dd-hh-mm-ss-name.png` ## Examples **Basic image:** ```bash uv run scripts/generate_image.py --prompt "A serene Japanese garden with cherry blossoms" --filename "2026-04-14-japanese-garden.png" ``` **With a local reference image (gen4_image):** ```bash uv run scripts/generate_image.py --prompt "@product on a marble counter, lifestyle photo" --model gen4_image --reference-images product=./product.jpg --filename "2026-04-14-product-lifestyle.png" ``` **With a reference image from a trusted origin (gen4_image_turbo — requires reference images):** ```bash uv run scripts/generate_image.py --prompt "A neon sign reading SALE in @style" --model gen4_image_turbo --reference-images style=https://cdn.yourapp.com/style.jpg --filename "draft.png" ``` ## Output - The script downloads the result and saves it to the specified path - Script outputs the full path to the saved file - **Do not read the image file back** -- just inform the user of the saved path ## Common Failures - `Error: No API key` -> set `RUNWAYML_API_SECRET` in the environment (e.g. `export RUNWAYML_API_SECRET=...` or a `.env` file). - `Error: Task failed -- SAFETY.INPUT.*` -> content moderation, suggest different prompt - `API error 429` -> rate limited, script auto-retries
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