For me, I prefer my clients sending me RGB files, as the software automatically converts that to the appropriate color format and depth. My large format printer uses 12 colors to print: Cyan, Magenta, Yellow, Black, Photo Cyan, Photo Magenta, Gray, Photo Gray, Medium Gray, Red, Blue, Green.

I can print up to 2880 x 2880 dpi.

CMYK conversion is usually too complicated for the average user to work with, I make the final decision and the print device accomodates.

GP