{
  "schemaVersion": 1,
  "recordType": "measurements-of-existing-browser-export-files",
  "input": {
    "file": "../../images/coffee.png",
    "bytes": 466706,
    "sha256": "cc02f8ca188b167c775a7101b5d767d1e71792cf762c33d6fa15a4599b5a8de7",
    "width": 600,
    "height": 400,
    "mode": "RGB",
    "pixels": 240000,
    "fullyOpaquePixels": 240000,
    "meanRgbCodeValues": [
      158.569087,
      85.794025,
      51.48475
    ],
    "anyChannelAt255Pixels": 1035,
    "anyChannelAt255Percent": 0.43125,
    "allChannelsAt255Pixels": 4,
    "allChannelsAt255Percent": 0.001667,
    "blackPixels": 0
  },
  "method": {
    "caseLabelBoundary": "The historical left-030/right-030 filenames refer to the displayed 0.30 slider, not a measured shader intensity. Source analysis indicates an internal initial value of 0.40 until the explicit third adjustment to 0.70; see run.json. This script measures only image files.",
    "colorSpaceBoundary": "Statistics operate on encoded 8-bit RGB code values, not linear-light radiance, exposure stops or colorimetric truth.",
    "clippingBoundary": "A channel value of 255 is an endpoint count. It does not prove every counted pixel is a new or objectionable clipped highlight.",
    "comparison": "Same-size files are compared directly; no crop, resize, color conversion profile, alignment correction or output image is written.",
    "regions": "Coordinates are source-image pixel boxes [x0,y0,x1,y1], excluding x1/y1. Region means average the signed differences of all three RGB channels.",
    "border": "The final row and final column share their bottom-right pixel; their union contains 999 pixels in a 600 \u00d7 400 image.",
    "scope": "One source, three browser exports; no model benchmark, physical lighting reference, inference speed or network measurement."
  },
  "cases": [
    {
      "id": "left-030",
      "output": {
        "file": "coffee-left-030.png",
        "bytes": 593646,
        "sha256": "03f5d7bedb3f049625428eed46aff3cd0d7afd0d7a1965f80c3978c45d3b164b",
        "width": 600,
        "height": 400,
        "mode": "RGBA",
        "pixels": 240000,
        "fullyOpaquePixels": 240000,
        "meanRgbCodeValues": [
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          95.827492,
          57.560913
        ],
        "anyChannelAt255Pixels": 31632,
        "anyChannelAt255Percent": 13.18,
        "allChannelsAt255Pixels": 5994,
        "allChannelsAt255Percent": 2.4975,
        "blackPixels": 999
      },
      "sourceComparison": {
        "meanAbsoluteRgbCodeDifference": 11.955108,
        "pixelsWithAnyDecreasedChannel": 999,
        "interiorPixelsWithAnyDecreasedChannel": 0,
        "lastRowEntirelyBlack": true,
        "lastColumnEntirelyBlack": true,
        "blackPixelsOnLastRowOrColumn": 999,
        "borderUnionPixelCount": 999
      },
      "regions": [
        {
          "id": "left-table",
          "boundsX0Y0X1Y1": [
            0,
            100,
            70,
            300
          ],
          "meanSignedRgbCodeDifference": 15.391071
        },
        {
          "id": "right-table",
          "boundsX0Y0X1Y1": [
            500,
            50,
            599,
            250
          ],
          "meanSignedRgbCodeDifference": 8.931734
        },
        {
          "id": "cup-interior",
          "boundsX0Y0X1Y1": [
            235,
            75,
            365,
            140
          ],
          "meanSignedRgbCodeDifference": 25.668521
        }
      ]
    },
    {
      "id": "right-030",
      "output": {
        "file": "coffee-right-030.png",
        "bytes": 593096,
        "sha256": "be9f5468d1056c98db3ab9dfc6462ed52237164d0b2847eb2e04f2b4a267b3ae",
        "width": 600,
        "height": 400,
        "mode": "RGBA",
        "pixels": 240000,
        "fullyOpaquePixels": 240000,
        "meanRgbCodeValues": [
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        ],
        "anyChannelAt255Pixels": 32577,
        "anyChannelAt255Percent": 13.57375,
        "allChannelsAt255Pixels": 5700,
        "allChannelsAt255Percent": 2.375,
        "blackPixels": 999
      },
      "sourceComparison": {
        "meanAbsoluteRgbCodeDifference": 12.989083,
        "pixelsWithAnyDecreasedChannel": 999,
        "interiorPixelsWithAnyDecreasedChannel": 0,
        "lastRowEntirelyBlack": true,
        "lastColumnEntirelyBlack": true,
        "blackPixelsOnLastRowOrColumn": 999,
        "borderUnionPixelCount": 999
      },
      "regions": [
        {
          "id": "left-table",
          "boundsX0Y0X1Y1": [
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            100,
            70,
            300
          ],
          "meanSignedRgbCodeDifference": 5.400048
        },
        {
          "id": "right-table",
          "boundsX0Y0X1Y1": [
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            50,
            599,
            250
          ],
          "meanSignedRgbCodeDifference": 25.205842
        },
        {
          "id": "cup-interior",
          "boundsX0Y0X1Y1": [
            235,
            75,
            365,
            140
          ],
          "meanSignedRgbCodeDifference": 26.292032
        }
      ]
    },
    {
      "id": "right-070",
      "output": {
        "file": "coffee-right-070.png",
        "bytes": 583048,
        "sha256": "1bad6f9905ec28b1450b5d2a61151f475da076ac122ae89ce2aa802b4e95354c",
        "width": 600,
        "height": 400,
        "mode": "RGBA",
        "pixels": 240000,
        "fullyOpaquePixels": 240000,
        "meanRgbCodeValues": [
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          63.2844
        ],
        "anyChannelAt255Pixels": 66895,
        "anyChannelAt255Percent": 27.872917,
        "allChannelsAt255Pixels": 8983,
        "allChannelsAt255Percent": 3.742917,
        "blackPixels": 999
      },
      "sourceComparison": {
        "meanAbsoluteRgbCodeDifference": 20.317206,
        "pixelsWithAnyDecreasedChannel": 999,
        "interiorPixelsWithAnyDecreasedChannel": 0,
        "lastRowEntirelyBlack": true,
        "lastColumnEntirelyBlack": true,
        "blackPixelsOnLastRowOrColumn": 999,
        "borderUnionPixelCount": 999
      },
      "regions": [
        {
          "id": "left-table",
          "boundsX0Y0X1Y1": [
            0,
            100,
            70,
            300
          ],
          "meanSignedRgbCodeDifference": 9.362381
        },
        {
          "id": "right-table",
          "boundsX0Y0X1Y1": [
            500,
            50,
            599,
            250
          ],
          "meanSignedRgbCodeDifference": 40.459529
        },
        {
          "id": "cup-interior",
          "boundsX0Y0X1Y1": [
            235,
            75,
            365,
            140
          ],
          "meanSignedRgbCodeDifference": 40.051913
        }
      ]
    }
  ],
  "outputPairs": [
    {
      "first": "left-030",
      "second": "right-030",
      "meanAbsoluteRgbCodeDifference": 7.807039,
      "changedPixels": 220544
    },
    {
      "first": "right-030",
      "second": "right-070",
      "meanAbsoluteRgbCodeDifference": 7.328122,
      "changedPixels": 226853
    }
  ]
}