I shoot film in both colour and black & white. Currently I have the negatives developed and scanned by a lab. My next step will be to get a 35mm film scanner and scan the developed negatives myself, which will save some money in the long run (and it's also out of pure interest). I've been reading up on colour calibration for scanners and how you can make a proper exposure of an IT8 target. This would allow you to make a slide that can serve as a calibration target for the scanner and the film's characteristics.
My two questions are:
Is it possible to do this for colour negatives? They need to have their colours inverted and have an orange mask which must be factored out, so is it even possible to have such a calibration target for a negative? Or can it only be done for a positive? Do you have to rely on provided profiles such as NegaFix in SilverFast or can you create those with a proper shot of an IT8 target?
Is this relevant for black & white? Colour temperatures won't matter there, but do you need to calibrate for, say, a proper 18 % gray value to get a good base image to adjust levels on?