{
  "1": {"class_type":"LoadImage","inputs":{"image":"portrait_src.png"}},
  "2": {"class_type":"BiRefNetRMBG","inputs":{
      "image":["1",0],"model":"BiRefNet-HR-matting",
      "mask_blur":0,"mask_offset":0,"invert_output":false,"refine_foreground":true,
      "background":"Alpha"}},
  "9": {"class_type":"SaveImage","inputs":{"images":["2",0],"filename_prefix":"matte_cutout"}},
  "10": {"class_type":"SaveImage","inputs":{"images":["2",2],"filename_prefix":"matte_mask"}}
}