You can try to do it with software like Adobe Gamma...but to do it properly you need calibration software and hardware.
I have to agree with Big Mike here. It made a world of difference when I did it using colorvision hardware/software. Pretty easy to use.
To add to other responses. What you want is not 'realism.' You want to see images the same as every other monitor and printer does. That is the purpose of calibrating to a standard. Then when you post an image, everyone sees it as you do. When you print it or get it printed, the printer understands what colors to produce.
