What you see (on the monitor) is rarely very close to what you get on the paper. Good enough for casual use, since perception is very adaptive, but not if you are particularly fussy about shades of difference.
So, one of the technical challenges for photographers today is making prints that actually look like you want them to, and being able to be sure that what you see on the monitor is reasonably close to what others will see and what the printer will print. Newer monitors are usually pretty accurate, but the more important subtle differences are, and the older the monitor, the more difficult this matching becomes. Color Management software is designed to help solve this problem, but the cost is quite high generally and most "tutorials" tend to be obscure to the novice.
One exception on both counts, which combines free open source software and a very easily understood and useful website, is at
http://www.scarse.org/ . If you are shooting and distributing via digital files, you don't need to worry about it, but if you expect to control what the prints will look like, you'll need to deal with these issues. So, check out the site, if it looks like too much trouble, just bookmark it for future reference.
Anyway, this as a free and helpful resource for those who can use it.
(Edit to add) It's pretty primitive at this stage, but if you have more time than money running the software (via command line) might be worth the trouble, but the basic information and calibration steps are worth a read, in any case.