image_with_gaps.json

{
  "data": [{
    "type": "image",
    "z": [
      [[1, 0, 0], [0, 1, 0], [0, 0, 1]],
      [[1, 0, 0], [0, 1, 0]],
      [[1, 0, 0]]
    ],
    "zmax": [1, 1, 1]
  }],
  "layout": {
    "yaxis": {"scaleanchor": null},
    "width": 400, "height": 400, "title": {"text": "Image with missing pixels"}
  }
}