rw-generate-image

par runwayml

Générer des images directement via l'API Runway à l'aide de scripts exécutables. Prend en charge le texte-à-image avec des images de référence optionnelles.

npx skills add https://github.com/runwayml/skills --skill rw-generate-image

Télécharger ZIP GitHub

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

uv run scripts/generate_image.py --prompt "your description" --filename "output.png" [--model gen4_image] [--ratio 1280:720] [--reference-images Tag=URL ...]

Preflight

command -v uv must succeed
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:

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):

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):

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