Remove an image background

# 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({
    "17": {
        "class_type": "LoadImage",
        "inputs": {
            "image": "UPLOADED_image_FILENAME"
        },
        "_meta": {
            "title": "Load Image"
        }
    },
    "18": {
        "class_type": "SaveImage",
        "inputs": {
            "filename_prefix": "Background_Removed",
            "images": [
                "19:16",
                0
            ]
        },
        "_meta": {
            "title": "Save Image"
        }
    },
    "19:13": {
        "class_type": "RemoveBackground",
        "inputs": {
            "bg_removal_model": [
                "19:14",
                0
            ],
            "image": [
                "17",
                0
            ]
        },
        "_meta": {
            "title": "Remove Background"
        }
    },
    "19:14": {
        "class_type": "LoadBackgroundRemovalModel",
        "inputs": {
            "bg_removal_name": "birefnet.safetensors"
        },
        "_meta": {
            "title": "Load Background Removal Model"
        }
    },
    "19:15": {
        "class_type": "InvertMask",
        "inputs": {
            "mask": [
                "19:13",
                0
            ]
        },
        "_meta": {
            "title": "Invert Mask"
        }
    },
    "19:16": {
        "class_type": "JoinImageWithAlpha",
        "inputs": {
            "alpha": [
                "19:15",
                0
            ],
            "image": [
                "17",
                0
            ]
        },
        "_meta": {
            "title": "Join Image with Alpha"
        }
    }
})
workflow.set_input("17", "image", client.assets.from_url("https://cdn.jsdelivr.net/gh/Comfy-Org/workflow_templates@90c71fb78b3726392d010ff62a8e79e92d7296ad/input/the_lily_veil.png"))

# run() also passes api_key to the partner nodes in this workflow.
job = client.run(workflow, api_key=api_key)
for output in job.get_outputs("18"):
    output.to_file(output.name)