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Problem is that RAW data will not match preview JPEGs (see below), but both RawDigger and RAW Therapy allow you to export as TIF.
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I prefer RawDigger because it is very accepting with regards to small anomalies and it’s quick. I then paste it on top of the lossless JPEG inside the intact file > save as new file and see if RawDigger can decode the file. So what I normally do is determine if this lossless JPEG exists inside the corrupt file and if so extract it. Key is that the RAW data inside a CR2 Canon RAW file is stored as lossless JPEG data. In my experience though this level of detail is not required. The file is structured as a TIFF file and could be decoded as one. Some knowledge about the CR2 file spec is needed but now a lot surprisingly enough. By examining a known good file and by comparing it to the corrupt file we can try to determine what’s wrong with the corrupt file(s) is if it’s repairable.
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Repair corrupt CR2 files (using a reference file) And also, if the CR2 looks like above example after you tried to recover it using file recovery software, a data recovery specialist may still be able to recover an intact file. If image is visually corrupt then probably now although I have seen rare cases where misalignment of data within a CR2 file resulted in this type of corruption. This is preferred over extraction of full resolution JPEG, because although this is better than nothing you lose a huge amount of data of course. So: If you can not open image at all it may be repairable. Example of CR2 file with 25% missing data due to fragmentation