Have a look here:

http://www.normankoren.com/makingfineprints1A.html

You can't.

OK - you can get close for most colours if you use the right software; I
don't know what that would be for those Windows things, but you can never
get it completely right. If it's *only* a matter of brightness then with
the right software you should get tolerably close. If you're looking to get
brightness and colour definition correct then you're almost certainly on a
loser. Whatever you do you will need feedback from printer output back to
the screen as the results will depend critically on the printing process.

You need to know whether all applications are dark. Adobe Gamma should
be sufficient, but it may simply be you need to use the brightness and
contrast controls of the monitor first. Generally, monitors should be
set to maximum contrast (the half black half white circle symbol on
on-screen controls, or the minotaur itself) and the brightness (sun
symbol) adjusted to a comfortable level.

It could be that the application you use to view pictures is assuming a
different monitor profile from the one you are creating in Adobe Gamma.
Really you need to check all settings, and make sure you do have colour
management enabled and operating consistently.

David

If the print output is as you want all you need do is adjust the brightness
of you monitor.