{
  "classes": [
    {
      "id": 0,
      "name": "background"
    },
    {
      "id": 1,
      "name": "red_ellipse"
    },
    {
      "id": 2,
      "name": "blue_rectangle"
    },
    {
      "id": 3,
      "name": "green_triangle"
    }
  ],
  "width": 256,
  "height": 256
}