The D-21 ARRIRAW has the white balance baked in, since back in 2002 we felt that it would be closer to the way film negative behaves. The EI setting is not baked in. The 2880 x 2160 pixel images (4:3 aspect ratio) are transported as 12 bit linear data.
The ALEXA ARRIRAW file format has neither the white balance nor the EI setting baked in. However, both white balance and EI that are set in the ALEXA are stored in the ARRIRAW header as metadata. This metadata will also include other information, including the green/magenta shift value (CC) that has been set in the camera. The 2880 x 1620 pixel images (16:9 aspect ratio) are transported as 12 bit log data, since this is a better way to transport ALEXA's wide dynamic range.
Both file formats can be transported via ARRIRAW T-link. The initial ALEXA ARRIRAW file format has been purposefully kept very close to the D-21 file format (both are 12 bit), since that means only minor modifications to the debayering algorithms used by the recorders and post tools. The recorders and post tools will be able to distinguish between D-21 and ALEXA ARRIRAW based on the metadata, so the whole thing is transparent to the user. In the future, we are planning other ARRIRAW formats to further exploit the capabilities of ALEXA.
Pure Digital supports Arriraw and the .ari file format from Alexa and D21
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