Runway: Reference to Image

# Python 3.10+: pip install comfy-sdk==0.4.0
import os

from comfy_sdk import Comfy

api_key = os.environ.get("COMFY_API_KEY", "").strip()
if not api_key: raise RuntimeError("Set COMFY_API_KEY")
os.environ.setdefault("COMFY_BASE_URL", "https://cloud.comfy.org")
client = Comfy(api_key=api_key)
workflow = client.workflows.from_json({
    "3": {
        "class_type": "RunwayTextToImageNode",
        "inputs": {
            "prompt": "An astronaut is lying on a recliner in a space city, deeply absorbed in reading a book.\n",
            "ratio": "1024:1024",
            "reference_image": [
                "5",
                0
            ]
        },
        "_meta": {
            "title": "Runway Text to Image"
        }
    },
    "5": {
        "class_type": "LoadImage",
        "inputs": {
            "image": "UPLOADED_image_FILENAME"
        },
        "_meta": {
            "title": "Load Image"
        }
    },
    "6": {
        "class_type": "SaveImage",
        "inputs": {
            "filename_prefix": "ComfyUI",
            "images": [
                "3",
                0
            ]
        },
        "_meta": {
            "title": "Save Image"
        }
    }
})
# Replace each example.com URL with a public URL of your file.
workflow.set_input("5", "image", client.assets.from_url("https://example.com/replace-with-a-url/image"))

# run() also passes api_key to the partner nodes in this workflow.
job = client.run(workflow, api_key=api_key)