[Gimp-user] CMYK/ RGB printing

[Richard Oliver]

I have noticed a considerable difference between printing on a CMYK 
printer and a RGB printer.
Is there a way to view the same picture both ways so as to adjust so as to 
keep the colours as true as possible?
I am sure that there is a better way of posing this question but I am 
afraid my knowledge of the subject is really limited.
I would value ideas please.
Richard