A comparison between the RAW and RGB Histograms in DPP

A couple of links...purely for educational value mind you.
http://www.digitalphot​opro.com …que/exposing-for-raw.html
http://www.digitalphot​opro.com …e-bit-depth-decision.html
http://www.digitaldog.​net/

Here is a way that a 8 bit curve can affect a 16 bit file. The curve is represented by Xin and Xout and the file is Yin and Yout.

Yin = (Xin / Xmax) * Ymax
Yout = Yin + ((Xin - Xout) * (Ymax / Xmax))

This equation uses a 8 bit term to scale a 16 bit term. The 16 bit data hasn't lost resolution it is being modulated by a 8 bit term.

So, are you concluding that you can't get the same results in the RGB tab that you can in the Raw tab, even if you are using a Raw file? I guess it must be built into the software if that's the case, since the RGB tab is there to process jpegs as well as Raws -- I guess they program things so that Raw shooters can get the most out of the Raw tabs. I don't know if such limits are imposed in Lightroom and/or ACR, although there are the innate limits from the jpeg conversion. Of course in LR and ACR there are the limits to the White Balance corrections that are "built in" for jpegs as well as tiffs, but I don't know about things like the blacks and whites.