function JPEGMetadata(imgFile)


This function extract various meta-information (including full EXIF data) about a JPEG image from a file (imgFile).


Example:

{
 mdata = JPEGMetadata('./self_portrait.jpg');
 Log(JSON.stringify(mdata));
}


Produces an output like this:


{
  "Exif": {
    "ApertureValue": [
      "149/32"
    ],
    "ColorSpace": [
      1
    ],
    "ComponentsConfiguration": "",
    "CompressedBitsPerPixel": [
      "5/1"
    ],
    "CustomRendered": [
      0
    ],
    "DateTime": "2003:12:14 12:01:44",
    "DateTimeDigitized": "2003:12:14 12:01:44",
    "DateTimeOriginal": "2003:12:14 12:01:44",
    "DigitalZoomRatio": [
      "2272/2272"
    ],
    "ExifIFDPointer": [
      196
    ],
    "ExifVersion": "0220",
    "ExposureBiasValue": [
      "0/3"
    ],
    "ExposureMode": [
      0
    ],
    "ExposureTime": [
      "1/500"
    ],
    "FNumber": [
      "49/10"
    ],
    "FileNumber": [
      1171771
    ],
    "FileSource": "",
    "FirmwareVersion": "Firmware Version 1.10",
    "Flash": [
      24
    ],
    "FlashpixVersion": "0100",
    "FocalLength": [
      2,
      682,
      286,
      215
    ],
    "FocalPlaneResolutionUnit": [
      2
    ],
    "FocalPlaneXResolution": [
      "2272000/280"
    ],
    "FocalPlaneYResolution": [
      "1704000/210"
    ],
    "ImageType": "IMG:PowerShot S40 JPEG",
    "InteroperabilityIFDPointer": [
      1416
    ],
    "InteroperabilityIndex": "R98",
    "Make": "Canon",
    "MakerNote": "",
    "MaxApertureValue": [
      "194698/65536"
    ],
    "MeteringMode": [
      2
    ],
    "Model": "Canon PowerShot S40",
    "ModelID": [
      17891328
    ],
    "Orientation": [
      1
    ],
    "PixelXDimension": [
      2272
    ],
    "PixelYDimension": [
      1704
    ],
    "ResolutionUnit": [
      2
    ],
    "SceneCaptureType": [
      0
    ],
    "SensingMethod": [
      2
    ],
    "ShutterSpeedValue": [
      "287/32"
    ],
    "ThumbJPEGInterchangeFormat": [
      2036
    ],
    "ThumbJPEGInterchangeFormatLength": [
      5448
    ],
    "UserComment": "",
    "WhiteBalance": [
      0
    ],
    "XResolution": [
      "180/1"
    ],
    "YCbCrPositioning": [
      1
    ],
    "YResolution": [
      "180/1"
    ]
  },
  "Height": 360,
  "Valid": true,
  "Width": 480
}