Welcome to the forum, @Henrik
DNG output contains a demosaiced image without additionally storing the original RAW image. This is why the original RAW image cannot be extracted from DPR’s output DNG files.
Instead of containing information in R, G, G, B (for four pixels), the output file contains RGB, RGB, RGB, RGB, which does indeed increase file size considerably (three times minus compression).
Read more about it here:
- File size of exported DNG is more than 4x larger than original RAW file
- Output File Size
- and possibly in other posts
Simple answer: Yes!