The intent and design of th Calibrate function is to use the ColorChecker charts as a basis to achieve "accurate" colors based on the color samples. There's nothing about calibration that is designed to make a Nikon look like a Canon. That's not the point.
As for #3, no, of course not...the calibration is for the camera supplied RAW files...trying to calibrate the camera JPEGS would be pretty far afield (and I doubt the results would be worthwhile).
Oh, and my name if Jeff...
First, sorry about the name mixup I had a collegue of that name so probably this was sticking in my memory.
The question about the ACR calibration was about how accurate it is. Since the calibration is on top of the calibration profile already in ACR the additional paramters (shadow tint, red primary hue, saturation, etc.) seems to be intended to tweak the calibration curve into a correct shape. I'm not a color management expert, but the theory says that in color management icc profiles and calibration is used to make sure that input and output icc profiles will convert colors correctly between source and destination. We use icc profiles in monitor calibration and printer calibration, so why don't we use icc profiles in ACR? Wouldn't that be the optimal assuming a reliable calibration and profiling process was at hand? Compared to an optimal calibration, how accurate is the ACR calibration?
I'm also wondering about the ACR default profile compared to the camera population. Is the calibration in the middle of that population or possibly at the edge, meaning that most camera owners have mildly incorrect color rendering from ACR?
Assuming that ACR calibration would be 100% accurate, wouldn't the consequence
of that be that colors from different camera models and brands look exactly the same? There is much talk about Canon and Nikon colors, but my view is that given a proper and accurate calibration there would be no such thing as Canon or Nikon colors. I don't need 100% accurate colors, but I like to have a normalized base to work from, just like I calibrate my monitor and each type of paper I use in my printer is profiled as well.
The point about jpg calibration was not about ACR at all, but about the possibility to calibrate a camera for in camera jpg processing. Is that possible? I assume that my in-camera jpg processing is not calibrated from the factory (even for a 1Ds mk3), but if course, I see a significant difference in colors between the ~5MP jpg thumbnail in RAW files from the 1Ds mk3 compared to the results from Lightroom (or ACR in PS CS3). As I don't use jpg's from the camera, it is a theoretical question for me.
But many thanks for the videos, they were informative, inspiring and humorous