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Most RAW files include a thumbnail for easy preview without having to process the image. It is not full resolution and is heavily compressed, so you don't need to really worry about the space consumption. Without it, nothing that doesn't know how to process RAW files would be able to show what the file contains. Ultimately, it is up to the camera if it ...


In general, it's a safe bet that this information is stored in the RAW file itself. With Canon, the preview is 1/4 the size of the original and a fairly heavily compressed JPEG, so I wouldn't worry about size.

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