New answers tagged canon-5d-mark-iii
According to this document under section 2.6 IFD #2 it's the uncompressed small version of the picture which has no white balance correction applied. CR2 files are based on the TIFF file format so it would make sense for the uncompressed data to be in the TIFF format. Its purpose is mostly for displaying the RAW histogram in tools like Digital Photo ...
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