{
  "id": "S09",
  "title": "Knockout group of a 50% cyan and a 50% magenta circle over yellow",
  "source": "research S9, DesignCraft DC05",
  "page": [360, 216],
  "settings": {"group_cs": "cmyk"},
  "objects": [
    {"type": "rect", "rect": [20, 20, 320, 176], "fill": {"cmyk": [0, 0, 100, 0]}},
    {
      "type": "group",
      "knockout": true,
      "objects": [
        {
          "type": "ellipse",
          "rect": [60, 38, 140, 140],
          "fill": {"cmyk": [100, 0, 0, 0]},
          "opacity": 0.5
        },
        {
          "type": "ellipse",
          "rect": [160, 38, 140, 140],
          "fill": {"cmyk": [0, 100, 0, 0]},
          "opacity": 0.5
        }
      ]
    }
  ],
  "expect": {
    "plates": ["Cyan", "Magenta", "Yellow", "Black"],
    "points": [
      {"at": [30, 108], "inks": {"Yellow": 100}, "tol": 2, "note": "yellow only"},
      {
        "at": [100, 108],
        "inks": {"Yellow": 50, "Cyan": 50},
        "tol": 6,
        "note": "cyan 50% over yellow"
      },
      {
        "at": [180, 108],
        "inks": {"Yellow": 50, "Magenta": 50},
        "tol": 6,
        "note": "overlap: only the top circle over the backdrop (without knockout C25 M50 Y25)"
      },
      {
        "at": [260, 108],
        "inks": {"Yellow": 50, "Magenta": 50},
        "tol": 6,
        "note": "magenta 50% over yellow"
      }
    ]
  },
  "structure": {
    "page_group": "DeviceCMYK",
    "knockout": true,
    "group_cs": ["none"],
    "color_spaces": ["DeviceCMYK"],
    "device_rgb": false,
    "output_intents": []
  }
}