exif

Image meta-information (EXIF, IPTC, XMP...) extraction using exiftool

NOTE: This fork from https://github.com/visionmedia/node-exif has a DIFFERENT (improved !) API. It uses precise tags for field access.

Installation

$ npm install Yvem/node-exif

Usage

var exif = require('exif2');

exif(file, function(err, obj){
  console.log(obj);

  // see available tags http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/index.html
  console.log(o['FileName']);
  console.log(o['Caption-Abstract']); // IPTC Caption [2,120]
})

{
	"SourceFile": "test/fixtures/forest.jpeg",
	"ExifToolVersion": 9.13,
	"FileName": "forest.jpeg",
	"Directory": "test/fixtures",
	"FileSize": "497 kB",
	"FileModifyDate": "2014:03:24 14:08:06+01:00",
	"FileAccessDate": "2014:03:24 15:27:05+01:00",
	"FileInodeChangeDate": "2014:03:24 15:26:50+01:00",
	"FilePermissions": "rw-r--r--",
	"FileType": "JPEG",
	"MIMEType": "image/jpeg",
	"CurrentIPTCDigest": "108d7872862d3e210ac6418bc7b5d6b2",
	"Caption-Abstract": "Voilà l'été !",
	"CopyrightNotice": "©photo : John Smith",
	"JFIFVersion": 1.01,
	"ExifByteOrder": "Big-endian (Motorola, MM)",
	"PhotometricInterpretation": "Color Filter Array",
	"Make": "NIKON CORPORATION",
	"Model": "NIKON D7000",
	"Orientation": "Horizontal (normal)",
	"XResolution": 72,
	"YResolution": 72,
	"ResolutionUnit": "inches",
	"Software": "Pixelmator 2.1.1",
	"ModifyDate": "2012:10:08 19:10:63",
	"ExposureTime": "1/80",
	"FNumber": 5.6,
	"ExposureProgram": "Aperture-priority AE",
	"ISO": 500,
	"DateTimeOriginal": "2012:10:07 11:36:30",
	"CreateDate": "2012:10:07 11:36:30",
	"ExposureCompensation": -2,
	"MaxApertureValue": 4,
	"MeteringMode": "Multi-segment",
	"LightSource": "Unknown",
	"Flash": "Off, Did not fire",
	"FocalLength": "10.0 mm",
	"UserComment": "",
	"SubSecTime": 50,
	"SubSecTimeOriginal": 50,
	"SubSecTimeDigitized": 50,
	"ColorSpace": "sRGB",
	"ExifImageWidth": 1971,
	"ExifImageHeight": 1306,
	"SensingMethod": "One-chip color area",
	"CustomRendered": "Normal",
	"ExposureMode": "Auto",
	"WhiteBalance": "Auto",
	"DigitalZoomRatio": 1,
	"FocalLengthIn35mmFormat": "15 mm",
	"SceneCaptureType": "Standard",
	"GainControl": "Low gain up",
	"Contrast": "Normal",
	"Saturation": "Normal",
	"Sharpness": "Normal",
	"SubjectDistanceRange": "Unknown",
	"ProfileCMMType": "Lino",
	"ProfileVersion": "2.1.0",
	"ProfileClass": "Display Device Profile",
	"ColorSpaceData": "RGB ",
	"ProfileConnectionSpace": "XYZ ",
	"ProfileDateTime": "1998:02:09 06:49:00",
	"ProfileFileSignature": "acsp",
	"PrimaryPlatform": "Microsoft Corporation",
	"CMMFlags": "Not Embedded, Independent",
	"DeviceManufacturer": "IEC ",
	"DeviceModel": "sRGB",
	"DeviceAttributes": "Reflective, Glossy, Positive, Color",
	"RenderingIntent": "Perceptual",
	"ConnectionSpaceIlluminant": "0.9642 1 0.82491",
	"ProfileCreator": "HP  ",
	"ProfileID": 0,
	"ProfileCopyright": "Copyright (c) 1998 Hewlett-Packard Company",
	"ProfileDescription": "sRGB IEC61966-2.1",
	"MediaWhitePoint": "0.95045 1 1.08905",
	"MediaBlackPoint": "0 0 0",
	"RedMatrixColumn": "0.43607 0.22249 0.01392",
	"GreenMatrixColumn": "0.38515 0.71687 0.09708",
	"BlueMatrixColumn": "0.14307 0.06061 0.7141",
	"DeviceMfgDesc": "IEC http://www.iec.ch",
	"DeviceModelDesc": "IEC 61966-2.1 Default RGB colour space - sRGB",
	"ViewingCondDesc": "Reference Viewing Condition in IEC61966-2.1",
	"ViewingCondIlluminant": "19.6445 20.3718 16.8089",
	"ViewingCondSurround": "3.92889 4.07439 3.36179",
	"ViewingCondIlluminantType": "D50",
	"Luminance": "76.03647 80 87.12462",
	"MeasurementObserver": "CIE 1931",
	"MeasurementBacking": "0 0 0",
	"MeasurementGeometry": "Unknown (0)",
	"MeasurementFlare": "0.999%",
	"MeasurementIlluminant": "D65",
	"Technology": "Cathode Ray Tube Display",
	"RedTRC": "(Binary data 2060 bytes)",
	"GreenTRC": "(Binary data 2060 bytes)",
	"BlueTRC": "(Binary data 2060 bytes)",
	"XMPToolkit": "XMP Core 4.4.0",
	"Subject": "",
	"SerialNumber": 5044750,
	"Lens": "Sigma 10-20mm F4-5.6 EX DC HSM",
	"ImageNumber": 6069,
	"FlashCompensation": 0,
	"ImageWidth": 900,
	"ImageHeight": 596,
	"EncodingProcess": "Baseline DCT, Huffman coding",
	"BitsPerSample": 8,
	"ColorComponents": 3,
	"YCbCrSubSampling": "YCbCr4:4:4 (1 1)",
	"Aperture": 5.6,
	"ImageSize": "900x596",
	"ScaleFactor35efl": 1.5,
	"ShutterSpeed": "1/80",
	"SubSecCreateDate": "2012:10:07 11:36:30.50",
	"SubSecDateTimeOriginal": "2012:10:07 11:36:30.50",
	"SubSecModifyDate": "2012:10:08 19:10:63.50",
	"CircleOfConfusion": "0.020 mm",
	"FOV": "100.4 deg",
	"FocalLength35efl": "10.0 mm (35 mm equivalent: 15.0 mm)",
	"HyperfocalDistance": "0.89 m",
	"LensID": "Unknown (809257734)",
	"LightValue": 9
}

Advanced usage

Errors

node-exif may throw custom errors :

• Metadata too big ! when metadata are too big to be parsed with current buffer limitations

Special options

For special cases, it is possible to provide exec options. exif() optional second parameter may be an exec() option object as described here : http://nodejs.org/api/child_process.html#child_process_child_process_exec_command_options_callback

Example usage : augment stdout buffer size to handle images with huge metadata :

// REM : default buffer value is 200*1024
exif(file, { maxBuffer: 1024*1024 }, function(err, obj) {
  console.log(obj);
})

Test / contribute

npm install
npm test

and also

make test
make bench

License

MIT