In Darktable, when extracting RAW and JPG from the camera and viewing them using lighttable mode, both look identical. Does this mean that they both contain post-processing done by the camera processor?
Then, when taking the RAW and going from lighttable to darkroom mode some properties of the picture changes significantly (the picture looks quite different). Is this because darkroom mode removes the in-camera post-processing?
Is there a way to get in darkroom, as a starting point, the RAW file just like we can see it in lighttable?
Answer
This is essentially the same as Why does my Lightroom preview change after loading? . The RAW file contains a JPEG preview, which reflects the camera's settings and will generally be the same as an in-camera JPEG (although usually in low quality to save space). That's what Darktable is showing you initially.
When you go to process the image, Darktable is working from the RAW itself. It's not removing in-camera processing -- it's just that that processing wasn't really there in any helpful way in the first place. (Clues to the processing may be included in the file's metadata, but usually as manufacturer-specific proprietary information.)
Darktable doesn't have access to the exact algorithms and settings used for the internal processing, so the basic answer to that part of your question is "sorry, no". Take a look at How can I reproduce the camera-internal postprocessing? for more on this.
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