How to recover data from corrupted RAW photos

By | February 17, 2019

JPG-Repair Toolkit allows you to recover data from corrupted RAW photos (JPEG). RAW photos contain the raw, ‘undeveloped’ sensor data from high-end digital cameras such as DSLRs from Canon, Sony, Nikon, Konica, Olympus etc.. JPG-Repair Toolkit can process multiple RAW files in batch.

High resolution, full frame JPEG from a corrupted RAW photo.

High resolution, full frame JPEG from a corrupted RAW photo.

Commonly these RAW photos embed one or more JPEGs: a low resolution thumbnail, a medium resolution preview, and in many cases a full frame preview.

Using JPG-Repair Toolkit you can extract the full frame preview. The latter is true even if resolution for the RAW photo was set to a lower value. There are tools available to extract this data from a RAW photo, but typically they parse intact files and refuse to work on corrupted files.

Other ‘repair’ software available only extracted either thumbnails or medium sized previews during my testing and as per customer’s comments (“I just purchased Stellar and all it does is save the thumbnail”). Following formats are currently supported:

Technically JPG-Repair Toolkit does not repair RAW files, it extracts JPEGs already embedded!

How to recover data from corrupted RAW photos using JPG-Repair Toolkit

Time needed: 1 minute, assuming you have downloaded JPG-Repair Toolkit.

4 steps away from recovering JPEGs from corrupted RAW photos Steps to extract JPEGs from corrupted RAW photos:

  1. Select a Repair mode > Pick Extract JPEG
  2. Select a minimum resolution (see below).
  3. Browse to the folder containing the corrupted RAW file(s) and select files you want to extract embedded JPEGs from.
  4. Click Repair.

For RAW files select a minimum resolution, probably > 1.9 (MP) to skip lower resolution thumbnails and medium sized previews.

Many RAW photo formats contain a full frame JPEG. If this setting is set to a too low value, JPG-Repair may simply extract the medium sized preview. If too high it will skip every JPEG it comes across.

JPG-Repair will get to work and save files using the following format: OriginalName-1.JPG.

For each file it is able to repair it will show a preview and certain details such as resolution.

 

Acknowledgements:

To determine signatures I examined RAW files taken from: http://www.rawsamples.ch/index.php/en/canon.
And also: https://www.wesaturate.com/.

 

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