Highly recommend using "SuperCal" http://www.bergdesign.com/supercal/
Its one of the best calibrators if you want to do it "manually" aka with your own eyes! Next thing would be to have a hardware solution like a color spyder calibrator. I recommend to calibrate to 2.2 gamma, 6500K. Have your display warm up at least 15 min before calibrating. You cannot "mess it up", because the calibrator just creates a calibration profile settings you either use or dont![]()
Absolutely! The iMac default profile is completely useless unless you're using your Mac under a whole bunch of bright fluorescent lighting. A quick calibration makes the world of difference.
I just used the thing in SysPrefs. Not being a photographer or graphic artist I don't need exact colour match. For me it's more about having something that looks great and doesn't tire your eyes.