As in topic title, does anyone know how to do it from under KDE? Both OS X and W 7 have easy way of doing that from system settings. I've seen somewhere kcm module for that which was using agryll, but unfortunately I've lost track of it.

Found it. http://www.oyranos.org/wiki/index.php?t ... or-manager
It's part of bigger project for colour management called Oyranos http://oyranos-cms.blogspot.com/. I'm really surprised that something like this isn't implemented already, and avaiable by default.