{
  "date": "2026-10-06",
  "method": "Actual UI-generated data:image/jpeg download bytes, then Pillow full decode; 8 successful runs and 3 failures",
  "browser_scope": "Codex in-app desktop browser; engine version not recorded; no physical-phone, other-engine, ICC, HDR or metadata claim",
  "outputs": [
    {
      "name": "flat-detail.jpg",
      "source": "flat-detail.png",
      "bytes": 2742,
      "sha256": "35aea1ce34dd8da668d10f639fedc19e9ec471b687f59b1ec7cc9417bef78f0a",
      "width": 257,
      "height": 129,
      "decoded_format": "JPEG",
      "mode": "RGB",
      "center_rgb": [
        0,
        0,
        0
      ]
    },
    {
      "name": "gray16-adjacent.jpg",
      "source": "gray16-adjacent.png",
      "bytes": 851,
      "sha256": "350b1eef370875cea496ef456472a03e56058720a05c0836b6647868dc26fe62",
      "width": 256,
      "height": 64,
      "decoded_format": "JPEG",
      "mode": "RGB",
      "center_rgb": [
        128,
        128,
        128
      ]
    },
    {
      "name": "noise-photo-like.jpg",
      "source": "noise-photo-like.png",
      "bytes": 30943,
      "sha256": "135590ad375d44bc24754fab0754d6a25d981d4a190f91bdb5228335904ea565",
      "width": 257,
      "height": 129,
      "decoded_format": "JPEG",
      "mode": "RGB",
      "center_rgb": [
        152,
        167,
        190
      ]
    },
    {
      "name": "palette-trns-black.jpg",
      "source": "palette-trns.png",
      "bytes": 1060,
      "sha256": "a12448759bd13b424be3c1e601e2f019d385431d3b951c3497019da7dbefb20f",
      "width": 256,
      "height": 128,
      "decoded_format": "JPEG",
      "mode": "RGB",
      "center_rgb": [
        29,
        0,
        188
      ]
    },
    {
      "name": "palette-trns-white.jpg",
      "source": "palette-trns.png",
      "bytes": 1074,
      "sha256": "33e53b1ffede0291391b6b6232a8f6d6d10a86871ab7f1a1afdd8fa8f6c6db4b",
      "width": 256,
      "height": 128,
      "decoded_format": "JPEG",
      "mode": "RGB",
      "center_rgb": [
        29,
        0,
        188
      ]
    },
    {
      "name": "rgba-bands-black.jpg",
      "source": "rgba-bands.png",
      "bytes": 1060,
      "sha256": "a12448759bd13b424be3c1e601e2f019d385431d3b951c3497019da7dbefb20f",
      "width": 256,
      "height": 128,
      "decoded_format": "JPEG",
      "mode": "RGB",
      "center_rgb": [
        29,
        0,
        188
      ]
    },
    {
      "name": "rgba-bands-white.jpg",
      "source": "rgba-bands.png",
      "bytes": 1074,
      "sha256": "33e53b1ffede0291391b6b6232a8f6d6d10a86871ab7f1a1afdd8fa8f6c6db4b",
      "width": 256,
      "height": 128,
      "decoded_format": "JPEG",
      "mode": "RGB",
      "center_rgb": [
        29,
        0,
        188
      ]
    },
    {
      "name": "side-4096.jpg",
      "source": "side-4096.png",
      "bytes": 1146,
      "sha256": "d04c85aca89903cada176d92b2b956e9c95f565a68d70433983cae1cc0b350e1",
      "width": 4096,
      "height": 8,
      "decoded_format": "JPEG",
      "mode": "RGB",
      "center_rgb": [
        12,
        81,
        159
      ]
    }
  ],
  "alpha_band_center_rgb": {
    "rgba-bands-white.jpg": [
      [
        255,
        255,
        255
      ],
      [
        255,
        127,
        126
      ],
      [
        0,
        0,
        254
      ],
      [
        191,
        255,
        192
      ]
    ],
    "rgba-bands-black.jpg": [
      [
        0,
        0,
        0
      ],
      [
        128,
        0,
        0
      ],
      [
        0,
        0,
        254
      ],
      [
        0,
        65,
        1
      ]
    ],
    "palette-trns-white.jpg": [
      [
        255,
        255,
        255
      ],
      [
        255,
        127,
        126
      ],
      [
        0,
        0,
        254
      ],
      [
        191,
        255,
        192
      ]
    ],
    "palette-trns-black.jpg": [
      [
        0,
        0,
        0
      ],
      [
        128,
        0,
        0
      ],
      [
        0,
        0,
        254
      ],
      [
        0,
        65,
        1
      ]
    ]
  },
  "gray16_precision_probe": {
    "input_gray_values": [
      32768,
      32769
    ],
    "output_rgb": [
      [
        128,
        128,
        128
      ],
      [
        128,
        128,
        128
      ]
    ]
  },
  "failures": [
    {
      "name": "side-4097.png",
      "error": "Image dimensions must be at most 4096 pixels per side and 16 million pixels total.",
      "download_count": 0
    },
    {
      "name": "truncated.png",
      "error": "This image could not be opened in this browser.",
      "download_count": 0
    },
    {
      "name": "renamed.png",
      "error": "This file is not a valid PNG file.",
      "download_count": 0
    }
  ],
  "limits_not_tested": [
    "20 MiB byte boundary",
    "16 million total pixels boundary"
  ],
  "encoder_quality_request": 0.92
}