getting data out of unknown tags

[grubin698]

Good morning,
I have a tif containing a radiographic (x-ray) image with associated metadata that was created by the x-ray capture software.
Using the Python exifread library, I can see that there is a tag called 0xFE68 that contains what looks to be a JSON-formatted string.


I'd like to replace the exifread library with exiftool, but I'm having trouble getting the full JSON-formatted string out of exiftool. 
I've tried various versions of stuff I've found about getting at unknown tag data, but have yet to get the full string.

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exiftool -u -exif_0xfe68  "radiograph.tif" > "H:\DATA\Laptop Xrays\xfe68.json" yields

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Exif 0xfe68                     : {"IsFavorite":false,"BackupFile":"","Setup":{"Type":"XT[...]
I've also tried

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-u -ee -exif_0xfe68

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-u -ee3 -exif_0xfe68and even

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-U -G3:1 -api requestall=3 -api largefilesupport -exif_0xfe68 but have yet to stumble upon the magic combination of switches that will give me the whole string. 

[Phil Harvey]

Your first try was very close.  All you needed to do was set the LimitLongValues option:  -api limitlongvalues=0

Also, you should add -s3 if you want to redirect the output to a JSON-format file.

- Phil

[grubin698]

Perfect! Thanks!

[StarGeek]

Your first try was very close.  All you needed to do was set the LimitLongValues option:  -api limitlongvalues=0

Also, you should add -s3 if you want to redirect the output to a JSON-format file.

Would the -b (-binary) option also have worked? Without need of the -api option?

[Phil Harvey]

Would the -b (-binary) option also have worked? Without need of the -api option?

Good point.  That would have been simpler.   ... TIMTOWTDI

- Phil