You can't export a raw file from EOS VR Utility, as debayering the raw data into an image is an intrinsic part of the stitching process. The pipeline goes something like this:
input RAW -> debayer -> stabilize -> stitch -> encode output
Once the debayering is complete, it is no longer raw. Instead of raw sensor data made of electrical values, it is now an image made of pixels.
Regarding the color space, there's probably two things at play here. There's the color space the output video is actually encoded in, and there's the NCLC tags in the metadata of the output file.
- The true color space of the output file
- You can select this in the raw development tab. Your options are Cinema Gamut, BT. 2020, DCI-P3, or BT. 709. This is choosing the color space that the raw sensor data gets debayered into.
- Upon export, this will carry through to the output file unless you select "H.264 (Apply LUT)", in which case EOS VR Utility will apply a LUT-based color space transform into Rec 709. If you stick with one of the flavors of ProRes, you should be fine.
- The NCLC tags in the output file
- There exists a metadata standard to specify the color space of a video file, and Pro Video Coalition has a great article on it, but the short version is that it consists of three numbers:
- Color Space
- Transfer function (sometimes incorrectly called "gamma")
- Color matrix
- Each of the three values is stored as a single number, a number which acts as a shorthand for a specific value defined in the standard. They are often written in the format "#-#-#". As an example, a video file with a 1 for the color space, a 1 for the transfer function, and a 1 for the color matrix would be said to "have been tagged as 1-1-1".
- If you look at the standard, you'll see that there just aren't that many valid values. And none of the existing values correspond to a proprietary manufacturer transfer function (such as Canon Log 2, Canon Log 3) nor to a proprietary manufacturer color space (such as Canon Cinema Gamut).
- So, since there's no existing "correct" value for proprietary data to tag the files with, it's common to just use the tag 1-1-1 (aka BT.709) just to fill in a valid metadata tag. (Remember "valid" is not the same as "correct")
In short: if you choose the desired color space and gamma in the RAW Development tab and export in ProRes, it should export as you'd expect. You can then bring it into your NLE of choice and use proper color management to get yourself into a good starting point for color correction and grading.
