If you want to do professional grade color, you have
to
go way beyond the narrow confines of thinking about color
as simply RGB color.
Implied from what you say there are scanners that _detect_
and record by methods other than by RGB. I haven't yet
seen any that do this, including many professional models.
Your words "way" or "narrow" I'd like to say I don't yet
follow,
without starting a flame war.
The RGB gamut and the CMYK gamut largely overlap,
So nobody's perfect but they can get along together.
John A.