How To Repair Images With Exiftool

Hullo Sascha,

In file you've posted, it was obvious that office at offset (where metadata/file construction is defined) is missing. So I have start looking for any paradigm data (raw or preview) from end of the file. If straight from camera, then raw image data is placed at the very cease of the file. And then, i only need to notice the last FFD8h value (which, in this case, defines start of raw prototype data). That is, ane need to extract all information from FFD8h value to the end of the file (signed with FFD9h) and save it somewhere (i.e. in memory buffer).
Now you take intakt CR2 file (from the aforementioned photographic camera model) and once more look for the last FFD8h position. Once yous discover that, cut the file at that position, add previously saved data (from buffer) and salvage as new CR2 file. That's all.
Of course, metadata (camera settings, etc.) and other prototype data (preview, etc.) inside newly generated CR2 file will have wrong data. Simply that'south not the problem for developing new jpg/tif from generated raw file -in virtually cases you'll demand to adjust WB properly. Needless to say, that you can't generate "original" CR2 file, because metadata (camera readings/settings) simply isn't there.
If you wish to keep "generated" CR2 file anyhow (meliorate generated than nothing), and then by using DPP, you can create jpg preview file (say, 1800x1200pix) from "generated" CR2 and embedd that jpg file back into CR2. Finally, you can modify existing (wrong) Exif metadata (DateTime, etc.). For embedding jpg preview and modifying metadata, you will apply ExifTool of form

Bogdan

Source: https://exiftool.org/forum/index.php?topic=4168.0

Posted by: brewerhistat.blogspot.com

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