Raster Histograms

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https://sampleserver6.arcgisonline.com/arcgis/rest/services/Toronto/ImageServer/1/info/histograms

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{
  "histograms": [
    <histogram1>,
    <histogram2>,
    <histogram3>,
    ...
  ]
}

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{
  "histograms": [
    {
      "size": 256,
      "min": -0.5,
      "max": 255.5,
      "counts": [
        42915,
        23218,
        24832,
        25925
        36054,
        57097,
        61278,
        65211
        ...
      ]
    },
    {
      "size": 256,
      "min": -0.5,
      "max": 255.5,
      "counts": [
        42915,
        23218,
        24832,
        25925
        36054,
        57097,
        61278,
        65211
        ...
      ]
    },
    {
      "size": 256,
      "min": -0.5,
      "max": 255.5,
      "counts": [
        42915,
        23218,
        24832,
        25925
        36054,
        57097,
        61278,
        65211
        ...
      ]
    }
  ]
}