{
  "date": "2026-09-18",
  "entryPoint": "Gemini Apps web",
  "method": "Two separate generations; full-size downloads; local browser Keep original cleanup and actual download inspection; sharp raw decoded pixel comparison within each pair",
  "limitations": [
    "No SynthID detector used",
    "No C2PA signature or trust-chain validation",
    "Not a same-image on/off comparison",
    "Not an exhaustive personal-data or manifest assertion analysis",
    "Different original formats; differences not attributed to setting"
  ],
  "results": [
    {
      "setting": "off",
      "width": 1264,
      "height": 848,
      "format": "jpeg",
      "original": {
        "url": "/images/blog/gemini-watermark/gemini-watermark-off-original.jpeg",
        "bytes": 796139,
        "sha256": "fb3e4a1d2d3f5add6c4708a6ef8e357f4f44e7de7381c187e411376ab6be2c5e"
      },
      "cleaned": {
        "url": "/images/blog/gemini-watermark/gemini-watermark-off-cleaned.jpeg",
        "bytes": 790113,
        "sha256": "971f0ece2ec3f29638cf59089a2f98fea7e11501ac1e1c132ffd297410b77a4f"
      },
      "beforeEntries": [
        {
          "id": "jpeg:app11:c2pa:1",
          "category": "provenance",
          "label": "C2PA Content Credentials",
          "container": "JUMBF",
          "sensitive": false,
          "disposition": "remove"
        }
      ],
      "afterEntries": [],
      "pixelsIdentical": true,
      "decodedPixelSha256": "d8aacca148a8925099df8c03f59df7fcfcfd4d3c01012f877b4d5450c8fbf46d",
      "browserDownloadVerified": true,
      "visibleMark": "Not observed in original or cleaned file"
    },
    {
      "setting": "on",
      "width": 1264,
      "height": 848,
      "format": "png",
      "original": {
        "url": "/images/blog/gemini-watermark/gemini-watermark-on-original.png",
        "bytes": 2133652,
        "sha256": "1f07cb06513eba115f530ae62c45128aeeec61da5efef69916ae27f6f69e7c1d"
      },
      "cleaned": {
        "url": "/images/blog/gemini-watermark/gemini-watermark-on-cleaned.png",
        "bytes": 2118469,
        "sha256": "4b5ed54f86188da1e1f781eddac58324e52d076bf3d09bc814031d9bff4dbec6"
      },
      "beforeEntries": [
        {
          "id": "png:cabx:1",
          "category": "provenance",
          "label": "C2PA Content Credentials",
          "container": "caBX",
          "sensitive": false,
          "disposition": "remove"
        }
      ],
      "afterEntries": [],
      "pixelsIdentical": true,
      "decodedPixelSha256": "3b0616d6dbcd127557bdd20630b37af16f8bb0b1f06705c1b0218d21871463fc",
      "browserDownloadVerified": true,
      "visibleMark": "Observed before and retained after cleanup"
    }
  ]
}