Exporting TIFFs from Canon's Digital Photo Professional will give you, in your TIFF, exactly what the sensor captured.
Using third party software will give you results, but, they will not be precise.
This can be demonstrated by opening a Canon CR2 in any number of RAW decoders (ACR/LR, CaptureOne, blah, blah, blah). None of them will render the image like DPP does. The one true Canon RAW converter.
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