{
  "images": {
    "phone_gps": {
      "style": "phone",
      "orientation": 1,
      "kb_with_exif": 296.9,
      "kb_without_exif": 296.4,
      "exif_overhead_kb": 0.6,
      "exif_dump": {
        "IFD0": {
          "0x8825": "394",
          "0x8769": "150",
          "Make": "Apple",
          "Model": "iPhone 14 Pro",
          "Software": "iOS 17.5.1",
          "Orientation": "1",
          "DateTime": "2026:09:20 14:32:11"
        },
        "ExifIFD": {
          "PixelXDimension": "1600",
          "DateTimeOriginal": "2026:09:20 14:32:11",
          "DateTimeDigitized": "2026:09:20 14:32:11",
          "PixelYDimension": "1200",
          "ISOSpeedRatings": "80",
          "FocalLength": "6.9",
          "LensModel": "iPhone 14 Pro back triple camera 6.86mm f/1.78",
          "LensMake": "Apple",
          "ExposureTime": "0.008333333333333333",
          "FNumber": "1.4"
        },
        "GPS_IFD": {
          "GPSVersionID": "b'\\x02\\x03\\x00\\x00'",
          "GPSLatitudeRef": "N",
          "GPSLatitude": "(39.0, 54.0, 26.0)",
          "GPSLongitudeRef": "E",
          "GPSLongitude": "(116.0, 23.0, 29.0)",
          "GPSAltitudeRef": "b'\\x00'",
          "GPSAltitude": "452.0",
          "GPSTimeStamp": "(6.0, 32.0, 11.0)",
          "GPSMapDatum": "WGS-84"
        }
      }
    },
    "camera_nogps": {
      "style": "camera",
      "orientation": 1,
      "kb_with_exif": 395.3,
      "kb_without_exif": 394.9,
      "exif_overhead_kb": 0.4,
      "exif_dump": {
        "IFD0": {
          "0x8769": "142",
          "Make": "Canon",
          "Model": "Canon EOS R6",
          "Software": "Firmware 1.8.0",
          "Orientation": "1",
          "DateTime": "2026:09:18 08:05:47"
        },
        "ExifIFD": {
          "PixelXDimension": "1600",
          "DateTimeOriginal": "2026:09:18 08:05:47",
          "DateTimeDigitized": "2026:09:18 08:05:47",
          "PixelYDimension": "1200",
          "ISOSpeedRatings": "400",
          "FocalLength": "50.0",
          "LensModel": "RF50mm F1.8 STM",
          "LensMake": "Canon",
          "ExposureTime": "0.004",
          "FNumber": "2.8"
        },
        "GPS_IFD": {}
      }
    },
    "phone_orientation6": {
      "style": "phone",
      "orientation": 6,
      "kb_with_exif": 296.9,
      "kb_without_exif": 296.4,
      "exif_overhead_kb": 0.6,
      "exif_dump": {
        "IFD0": {
          "0x8825": "394",
          "0x8769": "150",
          "Make": "Apple",
          "Model": "iPhone 14 Pro",
          "Software": "iOS 17.5.1",
          "Orientation": "6",
          "DateTime": "2026:09:20 14:32:11"
        },
        "ExifIFD": {
          "PixelXDimension": "1600",
          "DateTimeOriginal": "2026:09:20 14:32:11",
          "DateTimeDigitized": "2026:09:20 14:32:11",
          "PixelYDimension": "1200",
          "ISOSpeedRatings": "80",
          "FocalLength": "6.9",
          "LensModel": "iPhone 14 Pro back triple camera 6.86mm f/1.78",
          "LensMake": "Apple",
          "ExposureTime": "0.008333333333333333",
          "FNumber": "1.4"
        },
        "GPS_IFD": {
          "GPSVersionID": "b'\\x02\\x03\\x00\\x00'",
          "GPSLatitudeRef": "N",
          "GPSLatitude": "(39.0, 54.0, 26.0)",
          "GPSLongitudeRef": "E",
          "GPSLongitude": "(116.0, 23.0, 29.0)",
          "GPSAltitudeRef": "b'\\x00'",
          "GPSAltitude": "452.0",
          "GPSTimeStamp": "(6.0, 32.0, 11.0)",
          "GPSMapDatum": "WGS-84"
        }
      }
    }
  },
  "survival": {
    "canvas_jpeg_q80": {
      "format_detected": "JPEG",
      "exif_container_in_file": false,
      "tags_ifd0": 0,
      "tags_exif_ifd": 0,
      "tags_gps_ifd": 0,
      "gps_survives": false,
      "model_survives": false,
      "datetime_original_survives": false,
      "kb": 162.6
    },
    "canvas_webp_q80": {
      "format_detected": "WEBP",
      "exif_container_in_file": false,
      "tags_ifd0": 0,
      "tags_exif_ifd": 0,
      "tags_gps_ifd": 0,
      "gps_survives": false,
      "model_survives": false,
      "datetime_original_survives": false,
      "kb": 94.7
    },
    "canvas_png": {
      "format_detected": "PNG",
      "exif_container_in_file": false,
      "tags_ifd0": 0,
      "tags_exif_ifd": 0,
      "tags_gps_ifd": 0,
      "gps_survives": false,
      "model_survives": false,
      "datetime_original_survives": false,
      "kb": 1957.2
    },
    "pil_jpeg_q80_default": {
      "format_detected": "JPEG",
      "exif_container_in_file": false,
      "tags_ifd0": 0,
      "tags_exif_ifd": 0,
      "tags_gps_ifd": 0,
      "gps_survives": false,
      "model_survives": false,
      "datetime_original_survives": false,
      "kb": 167.5
    },
    "pil_jpeg_q80_keep_exif": {
      "format_detected": "JPEG",
      "exif_container_in_file": true,
      "tags_ifd0": 7,
      "tags_exif_ifd": 10,
      "tags_gps_ifd": 9,
      "gps_survives": true,
      "model_survives": true,
      "datetime_original_survives": true,
      "kb": 168.1
    },
    "pil_png": {
      "format_detected": "PNG",
      "exif_container_in_file": false,
      "tags_ifd0": 0,
      "tags_exif_ifd": 0,
      "tags_gps_ifd": 0,
      "gps_survives": false,
      "model_survives": false,
      "datetime_original_survives": false,
      "kb": 1269.3
    },
    "pil_webp_q80": {
      "format_detected": "WEBP",
      "exif_container_in_file": false,
      "tags_ifd0": 0,
      "tags_exif_ifd": 0,
      "tags_gps_ifd": 0,
      "gps_survives": false,
      "model_survives": false,
      "datetime_original_survives": false,
      "kb": 94.1
    }
  },
  "environment": {
    "browser": "151.0.7922.34"
  },
  "orientation_test": {
    "stored_dims_of_real_portrait_photo": [
      1200,
      1600
    ],
    "browser_natural_width": 1200,
    "browser_natural_height": 1600,
    "canvas_output_width": 1200,
    "canvas_output_height": 1600,
    "output_px_dimensions": [
      1200,
      1600
    ],
    "orientation_tag_in_output": false,
    "note": "Chromium 自动按 Orientation 转正并丢弃该 tag"
  }
}