retrieving exif data blob

Added by folkert van heusden about 1 month ago

Hi,

I would like to add the exif data by hand: while generating a jpeg-file, just before the pixels are written, I would like to dump the exif blob.
How can I retrieve the exif data as binary data that can be inserted in a JPEG_APP+1?


Replies (2)

RE: retrieving exif data blob - Added by Robin Mills about 1 month ago

I don't believe we have command options for this exact feature. However Exiv2 can help you to achieve this goal.

The command:

$ exiv2 -pS image
will review the structure of the JPG. For example:
$ exiv2 -pS ~/Stonehenge.jpg 
STRUCTURE OF JPEG FILE: /Users/rmills/Stonehenge.jpg
 address | marker       |  length | data
       0 | 0xffd8 SOI  
       2 | 0xffe1 APP1  |   15288 | Exif..II*......................
   15292 | 0xffe1 APP1  |    2610 | http://ns.adobe.com/xap/1.0/.<?x
   17904 | 0xffed APP13 |      96 | Photoshop 3.0.8BIM.......'.....
   18002 | 0xffe2 APP2  |    4094 | MPF.II*...............0100.....
   22098 | 0xffdb DQT   |     132 
   22232 | 0xffc0 SOF0  |      17 
   22251 | 0xffc4 DHT   |     418 
   22671 | 0xffda SOS  
$ 
We support the options: -pX to extract XMP (xml) to stdout and -pC to extract the ICC profile to stdout. There is no option -pE to extract Exif to stdout. Nobody has ever mention anything like this before! However you can use the utility dd to extract this data using this using the information on the line:
       2 | 0xffe1 APP1  |   15288 | Exif..II*......................
This is discussed here: http://dev.exiv2.org/projects/exiv2/wiki/The_Metadata_in_TIFF_files

There's a quick way to do this with the option -ee which extracts the exif metadata into a .exv file.

$ exiv2 -pS ~/Stonehenge.exv 
STRUCTURE OF JPEG FILE: /Users/rmills/Stonehenge.exv
 address | marker       |  length | data
       0 | 0xff01      
       7 | 0xffe1 APP1  |   15296 | Exif..II*......................
   15305 | 0xffd9 EOI  
$ 
I believe it's easy edit that file as you only need to replace the single APP1 segment with your data. The exif data block in the modified .exv file can be inserted into the original (or another JPEG) with the command $ exiv2 -ie image which will read from image.exv

So, although I don't believe there is a single command to achieve your goal, a little bash scripting will deliver the capability you have requested.

RE: retrieving exif data blob - Added by Robin Mills about 1 month ago

Another comment about this. You'll find the following command useful for debugging your script.

$ exiv2 -pR image
This will Recursively print the structure of your JPEG. In addition to the structure information displayed by -pS, the recursive variant will also dump the contents of TIFF, IPTC and some other types of metadata. For example:
$ exiv2 -pR ~/Stonehenge.jpg 
STRUCTURE OF JPEG FILE: /Users/rmills/Stonehenge.jpg
 address | marker       |  length | data
       0 | 0xffd8 SOI  
       2 | 0xffe1 APP1  |   15288 | Exif..II*......................
  STRUCTURE OF TIFF FILE (II): MemIo
   address |    tag                              |      type |    count |    offset | value
        10 | 0x010f Make                         |     ASCII |       18 |       146 | NIKON CORPORATION
        22 | 0x0110 Model                        |     ASCII |       12 |       164 | NIKON D5300
        34 | 0x0112 Orientation                  |     SHORT |        1 |           | 1
        46 | 0x011a XResolution                  |  RATIONAL |        1 |       176 | 300/1
        58 | 0x011b YResolution                  |  RATIONAL |        1 |       184 | 300/1
        70 | 0x0128 ResolutionUnit               |     SHORT |        1 |           | 2
        82 | 0x0131 Software                     |     ASCII |       10 |       192 | Ver.1.00 
        94 | 0x0132 DateTime                     |     ASCII |       20 |       202 | 2015:07:16 20:25:28
       106 | 0x0213 YCbCrPositioning             |     SHORT |        1 |           | 1
       118 | 0x8769 ExifTag                      |      LONG |        1 |           | 222
    STRUCTURE OF TIFF FILE (II): MemIo
     address |    tag                              |      type |    count |    offset | value
         224 | 0x829a ExposureTime                 |  RATIONAL |        1 |       732 | 10/4000
         236 | 0x829d FNumber                      |  RATIONAL |        1 |       740 | 100/10
         248 | 0x8822 ExposureProgram              |     SHORT |        1 |           | 0
         260 | 0x8827 ISOSpeedRatings              |     SHORT |        1 |           | 200
         272 | 0x8830 SensitivityType              |     SHORT |        1 |           | 2
         284 | 0x9000 ExifVersion                  | UNDEFINED |        4 |           | 0230
         296 | 0x9003 DateTimeOriginal             |     ASCII |       20 |       748 | 2015:07:16 15:38:54
         308 | 0x9004 DateTimeDigitized            |     ASCII |       20 |       768 | 2015:07:16 15:38:54
         320 | 0x9101 ComponentsConfiguration      | UNDEFINED |        4 |           | ...
         332 | 0x9102 CompressedBitsPerPixel       |  RATIONAL |        1 |       788 | 2/1
         344 | 0x9204 ExposureBiasValue            | SRATIONAL |        1 |       796 | 0/6
         356 | 0x9205 MaxApertureValue             |  RATIONAL |        1 |       804 | 43/10
         368 | 0x9207 MeteringMode                 |     SHORT |        1 |           | 5
         380 | 0x9208 LightSource                  |     SHORT |        1 |           | 0
         392 | 0x9209 Flash                        |     SHORT |        1 |           | 16
         404 | 0x920a FocalLength                  |  RATIONAL |        1 |       812 | 440/10
         416 | 0x927c MakerNote                    | UNDEFINED |     3152 |       914 | Nikon.....II*.....9.........0211 ...
      STRUCTURE OF TIFF FILE (II): MemIo
       address |    tag                              |      type |    count |    offset | value
            10 | 0x0001 Version                      | UNDEFINED |        4 |           | 0211
            22 | 0x0002 ISOSpeed                     |     SHORT |        2 |           | 0 200
            34 | 0x0004 Quality                      |     ASCII |        8 |       698 | NORMAL 
            46 | 0x0005 WhiteBalance                 |     ASCII |       13 |       706 | AUTO        
            58 | 0x0007 Focus                        |     ASCII |        7 |       719 | AF-A  
            70 | 0x0008 FlashSetting                 |     ASCII |       13 |       726 |             
            82 | 0x0009 GPSStatus                    |     ASCII |       20 |       739 |                    
            94 | 0x000b ProcessingSoftware           |    SSHORT |        2 |           | 0 0
           106 | 0x000c GPSSpeedRef                  |  RATIONAL |        4 |       759 | 538/256 354/256 256/256 256/256
           118 | 0x000d GPSSpeed                     | UNDEFINED |        4 |           | ...
           130 | 0x000e GPSTrackRef                  | UNDEFINED |        4 |           | ...
           142 | 0x0012 GPSMapDatum                  | UNDEFINED |        4 |           | ...
           154 | 0x0013 GPSDestLatitudeRef           |     SHORT |        2 |           | 0 200
           166 | 0x0016 GPSDestLongitude             |     SHORT |        4 |       791 | 0 0 6000 4000
           178 | 0x0017 GPSDestBearingRef            | UNDEFINED |        4 |           | ...
           190 | 0x0018 GPSDestBearing               | UNDEFINED |        4 |           | ...
           202 | 0x0019 GPSDestDistanceRef           | SRATIONAL |        1 |       799 | 0/6
           214 | 0x001b GPSProcessingMethod          |     SHORT |        7 |       807 | 0 6016 4016 6016 4016 ...
           226 | 0x001c GPSAreaInformation           | UNDEFINED |        3 |           | ...
           238 | 0x001d GPSDateStamp                 |     ASCII |        8 |       821 | 2567806
           250 | 0x001e GPSDifferential              |     SHORT |        1 |           | 1
           262 | 0x001f                              | UNDEFINED |        8 |       829 | 0100...
           274 | 0x0022                              |     SHORT |        1 |           | 65535
           286 | 0x0023                              | UNDEFINED |       58 |       837 | 0100STANDARD............STANDARD ...
           298 | 0x0024                              | UNDEFINED |        4 |           | ...
           310 | 0x0025                              | UNDEFINED |       14 |       895 | H.....H......
           322 | 0x002b                              | UNDEFINED |       16 |       909 | 0100...........
           334 | 0x002c                              | UNDEFINED |      574 |       925 | 0101#.......................... ...
           346 | 0x002d                              |     SHORT |        3 |      1499 | 512 0 0
           358 | 0x0032                              | UNDEFINED |        8 |      1505 | 0100...
           370 | 0x0035                              | UNDEFINED |        6 |      1513 | 0200.
           382 | 0x003b                              |  RATIONAL |        4 |      1519 | 256/256 256/256 256/256 256/256
           394 | 0x003c                              |     SHORT |        1 |           | 1
           406 | 0x0083                              |      BYTE |        1 |           | .
           418 | 0x0084                              |  RATIONAL |        4 |      1551 | 180/10 2500/10 35/10 63/10
           430 | 0x0087                              |      BYTE |        1 |           | 
           442 | 0x0089                              |     SHORT |        1 |           | 0
           454 | 0x008a                              |     SHORT |        1 |           | 1
           466 | 0x008b                              | UNDEFINED |        4 |           | 7..
           478 | 0x0095                              |     ASCII |        5 |      1583 | OFF 
           490 | 0x0097                              | UNDEFINED |     1188 |      1588 | 0219.dU....W..2......:.......F.# ...
           502 | 0x0098                              | UNDEFINED |       33 |      2776 | 0204.W....z.o..#[.....!o.x..E... ...
           514 | 0x009d                              |     SHORT |        1 |           | 0
           526 | 0x009e                              |     SHORT |       10 |      2809 | 0 0 0 0 0 ...
           538 | 0x00a2                              |      LONG |        1 |           | 6173648
           550 | 0x00a3                              |      BYTE |        1 |           | 
           562 | 0x00a7                              |      LONG |        1 |           | 9608
           574 | 0x00a8                              | UNDEFINED |       49 |      2829 | 0106........................... ...
           586 | 0x00ab                              |     ASCII |       16 |      2878 | AUTO(FLASH OFF)
           598 | 0x00b0                              | UNDEFINED |       16 |      2894 | 0100...........
           610 | 0x00b1                              |     SHORT |        1 |           | 4
           622 | 0x00b6                              | UNDEFINED |        8 |      2910 | .......
           634 | 0x00b7                              | UNDEFINED |       30 |      2918 | 0100....i....................
           646 | 0x00b8                              | UNDEFINED |      172 |      2948 | 0100..e........................ ...
           658 | 0x00bb                              | UNDEFINED |        8 |      3120 | 0200...
           670 | 0x00bf                              |     SHORT |        1 |           | 0
           682 | 0x00c0                              | UNDEFINED |        8 |      3128 | <......
      END MemIo
         428 | 0x9286 UserComment                  | UNDEFINED |       44 |       820 | ASCII...                         ...
         440 | 0x9290 SubSecTime                   |     ASCII |        3 |           | 00
         452 | 0x9291 SubSecTimeOriginal           |     ASCII |        3 |           | 00
         464 | 0x9292 SubSecTimeDigitized          |     ASCII |        3 |           | 00
         476 | 0xa000 FlashpixVersion              | UNDEFINED |        4 |           | 0100
         488 | 0xa001 ColorSpace                   |     SHORT |        1 |           | 1
         500 | 0xa002 PixelXDimension              |     SHORT |        1 |           | 6000
         512 | 0xa003 PixelYDimension              |     SHORT |        1 |           | 4000
         524 | 0xa005 InteroperabilityTag          |      LONG |        1 |           | 4306
         536 | 0xa217 SensingMethod                |     SHORT |        1 |           | 2
         548 | 0xa300 FileSource                   | UNDEFINED |        1 |           | .
         560 | 0xa301 SceneType                    | UNDEFINED |        1 |           | .
         572 | 0xa302 CFAPattern                   | UNDEFINED |        8 |       864 | ........
         584 | 0xa401 CustomRendered               |     SHORT |        1 |           | 0
         596 | 0xa402 ExposureMode                 |     SHORT |        1 |           | 0
         608 | 0xa403 WhiteBalance                 |     SHORT |        1 |           | 0
         620 | 0xa404 DigitalZoomRatio             |  RATIONAL |        1 |       872 | 1/1
         632 | 0xa405 FocalLengthIn35mmFilm        |     SHORT |        1 |           | 66
         644 | 0xa406 SceneCaptureType             |     SHORT |        1 |           | 0
         656 | 0xa407 GainControl                  |     SHORT |        1 |           | 0
         668 | 0xa408 Contrast                     |     SHORT |        1 |           | 0
         680 | 0xa409 Saturation                   |     SHORT |        1 |           | 0
         692 | 0xa40a Sharpness                    |     SHORT |        1 |           | 0
         704 | 0xa40c SubjectDistanceRange         |     SHORT |        1 |           | 0
         716 | 0xa420 ImageUniqueID                |     ASCII |       33 |       880 | 090caaf2c085f3e102513b24750041aa ...
    END MemIo
       130 | 0x8825 GPSTag                       |      LONG |        1 |           | 4060
      4338 | 0x0103 Compression                  |     SHORT |        1 |           | 6
      4350 | 0x011a XResolution                  |  RATIONAL |        1 |      4426 | 300/1
      4362 | 0x011b YResolution                  |  RATIONAL |        1 |      4434 | 300/1
      4374 | 0x0128 ResolutionUnit               |     SHORT |        1 |           | 2
      4386 | 0x0201 JPEGInterchangeFormat        |      LONG |        1 |           | 4442
      4398 | 0x0202 JPEGInterchangeFormatLength  |      LONG |        1 |           | 10837
      4410 | 0x0213 YCbCrPositioning             |     SHORT |        1 |           | 1
  END MemIo
   15292 | 0xffe1 APP1  |    2610 | http://ns.adobe.com/xap/1.0/.<?x
   17904 | 0xffed APP13 |      96 | Photoshop 3.0.8BIM.......'.....
  Record | DataSet | Name                     | Length | Data
       1 |       0 | ModelVersion             |      2 | ..
       1 |      90 | CharacterSet             |      3 | .%G
       2 |       0 | RecordVersion            |      2 | ..
       2 |     120 | Caption                  |     12 | Classic View
   18002 | 0xffe2 APP2  |    4094 | MPF.II*...............0100.....
  STRUCTURE OF TIFF FILE (II): MemIo
   address |    tag                              |      type |    count |    offset | value
        10 | 0xb000 MPFVersion                   | UNDEFINED |        4 |           | 0100
        22 | 0xb001 MPFNumberOfImages            |      LONG |        1 |           | 3
        34 | 0xb002 MPFImageList                 | UNDEFINED |       48 |        52 | .....N_............@.....G^.... ...
  END MemIo
   22098 | 0xffdb DQT   |     132 
   22232 | 0xffc0 SOF0  |      17 
   22251 | 0xffc4 DHT   |     418 
   22671 | 0xffda SOS  
$ 

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