Isn't that what Nikon's Active-D lighting settings do? I don't use it, I use RAW, but just addressing the point above.
Thanks,
Rob.
FUJI has similar in-built system to Nikon D-Lighting, albeit applied quite differently, it is called dynamic range expansion.
Unlike Nikon where D-Lighting works with JPEGs only, it is incorporated in RAW with FUJI. It works by using higher ISO for dark areas and holding it for highlights. Effectively you are trading low ISO for higher dynamic range. Let's say ISO 800 instead of ISO 200 will give you an equivalent of 400% of dynamic range, and most of expansion is in highlights.
Nevertheless,I never used Nikon D-Lighting nor FUJI DR expansion. I think it is much better to do in pp in CaptureOne Pro.
I am not an expert, but AFAIK since the blue channel gets blown most often, C1 extends hightlight range by using channels that are not blown, i.e. red or green, and does it quite cleverly by extrapolating and recovering the full colour. I think it is a completely different approach to Nikon D-Lighting.