{
  "date": "2026-10-24",
  "scope": "Author-created synthetic fixtures; eight actual desktop public-tool downloads, not native Gemini downloads or population success rates.",
  "definitions": {
    "max_rgb_difference": "Largest absolute decoded RGB-channel difference, 0–255",
    "changed_pixel": "At least one unequal RGB channel",
    "outside": "Outside the known fixture rectangle, not a guessed detection box",
    "byte_identity": "Equality of complete-file SHA-256"
  },
  "rows": [
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      "id": "1024x768-text",
      "kind": "text",
      "width": 1024,
      "height": 768,
      "gate_passed": false,
      "max_rgb_difference_vs_input": 0,
      "changed_pixels_vs_input": 0,
      "changed_pixels_outside_known_box": 0,
      "max_rgb_difference_vs_reference": 116,
      "same_complete_file_bytes": true,
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      "download_sha256": "98b5cb6b55365a96614361af29046b58d7cd315831fe08f8dfdb61510130cba2",
      "source": "Actual public-tool browser downloads; original files and UI receipts preserved"
    },
    {
      "id": "1024x768-ring",
      "kind": "ring",
      "width": 1024,
      "height": 768,
      "gate_passed": false,
      "max_rgb_difference_vs_input": 0,
      "changed_pixels_vs_input": 0,
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      "same_complete_file_bytes": true,
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      "download_sha256": "69a574932ce6b72f4a60632b87d774b31ea51a50a627f7704f7aaf965a379e20",
      "source": "Actual public-tool browser downloads; original files and UI receipts preserved"
    },
    {
      "id": "1024x768-diamond",
      "kind": "diamond",
      "width": 1024,
      "height": 768,
      "gate_passed": false,
      "max_rgb_difference_vs_input": 0,
      "changed_pixels_vs_input": 0,
      "changed_pixels_outside_known_box": 0,
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      "same_complete_file_bytes": true,
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      "download_sha256": "434e5b7e31afd41ee86f822c8dcce2fd498476524922eaf9c8fd7e988305c084",
      "source": "Actual public-tool browser downloads; original files and UI receipts preserved"
    },
    {
      "id": "1024x768-matched-star",
      "kind": "matched-star",
      "width": 1024,
      "height": 768,
      "gate_passed": true,
      "max_rgb_difference_vs_input": 83,
      "changed_pixels_vs_input": 883,
      "changed_pixels_outside_known_box": 0,
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      "download_sha256": "f79e25adc9ff44efd27fbfdad5ddff0f5f262a96ec8ce5f7f1f27d49de67fb68",
      "source": "Actual public-tool browser downloads; original files and UI receipts preserved"
    },
    {
      "id": "1200x896-text",
      "kind": "text",
      "width": 1200,
      "height": 896,
      "gate_passed": false,
      "max_rgb_difference_vs_input": 0,
      "changed_pixels_vs_input": 0,
      "changed_pixels_outside_known_box": 0,
      "max_rgb_difference_vs_reference": 118,
      "same_complete_file_bytes": true,
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      "download_sha256": "71801f6c0c24113b0314adee30e5baa2a64a2bbefaada1bbfdb8a249e1000dd5",
      "source": "Actual public-tool browser downloads; original files and UI receipts preserved"
    },
    {
      "id": "1200x896-ring",
      "kind": "ring",
      "width": 1200,
      "height": 896,
      "gate_passed": false,
      "max_rgb_difference_vs_input": 0,
      "changed_pixels_vs_input": 0,
      "changed_pixels_outside_known_box": 0,
      "max_rgb_difference_vs_reference": 118,
      "same_complete_file_bytes": true,
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      "download_sha256": "829da6fd046b8c30b572103ec50cb297ddb775b00835b9badb0879363acd7a73",
      "source": "Actual public-tool browser downloads; original files and UI receipts preserved"
    },
    {
      "id": "1200x896-diamond",
      "kind": "diamond",
      "width": 1200,
      "height": 896,
      "gate_passed": true,
      "max_rgb_difference_vs_input": 121,
      "changed_pixels_vs_input": 4634,
      "changed_pixels_outside_known_box": 0,
      "max_rgb_difference_vs_reference": 121,
      "same_complete_file_bytes": false,
      "input_sha256": "c9a389bad36f936514836f3d4278609407d35b9a18b7a5b82132bb1fada8891d",
      "download_sha256": "2ea5b28f34674b1b8053c7bad7168cc288111be968dbcd03fe2418d137e998c2",
      "source": "Actual public-tool browser downloads; original files and UI receipts preserved"
    },
    {
      "id": "1200x896-matched-star",
      "kind": "matched-star",
      "width": 1200,
      "height": 896,
      "gate_passed": true,
      "max_rgb_difference_vs_input": 85,
      "changed_pixels_vs_input": 4634,
      "changed_pixels_outside_known_box": 0,
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      "same_complete_file_bytes": false,
      "input_sha256": "98e267d5be5cdc62d9d4c90f10486e17b542cf1b934c80712edc200ea071712d",
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      "source": "Actual public-tool browser downloads; original files and UI receipts preserved"
    }
  ]
}