I have an interest in camera calibration from a technical perspective and I'd like to know how to perform a high-end camera calibration, for say reproduction photography. I'm assuming that a 24 patch color checker is not used for high-end stuff. I've also heard that checkers do vary a bit in color copy to copy, so one would need a measured one (with a high-end spectrophotometer I guess) and a table with the actual colors to feed into the calibration software. Or maybe everyone's using monochromators rather than color checkers these days?
Is there any pointers/books out there that shows how to do it properly?