TIFF is a lossless format for sure, but doesn't RAW hold 'excess' data beyond R, G, and B channel info that would not be supported by TIFF? I'm half guessing and following my gut here, and the other half genuinely asking a question, but this sounds incorrect to me? I think my gut is a lot responding to the "tiff is a raw format" idea (but I am happy to be proven wrong) -thank you