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All of this technical mumbo-jumbo, says Canon USA's Westfall, means that high ISO image quality from the EOS-1D Mark IV is promised to handily surpass the EOS-1D Mark III, despite the older model's pixel size advantage. This is true both in the JPEGs rolling out of the camera, as well its RAW CR2 files, he says. In other words, Westfall is emphasizing that the camera's better high ISO image quality doesn't stem from the EOS-1D Mark IV's twin DIGIC 4 processors massaging the heck out of noisy RAW data and turning it into clean camera JPEGs. Rather, it's the fact the RAW data emerging from the sensor is noticeably less noisy in the first place.