Colors in iPhoto look great - not when pics are viewed on web / printed out

November 30 0
When I go in and adjust my images in iPhoto, nothing looks the same when I print them out at costco or view them on the web.
I understand about profiles and color spaces... I'm just wondering what is the easiest way other iPhoto users have found to calibrate their macs so that what they view in iPhoto is what they will see when printing the images.
I am having the EXACT same problem and it's driving me crazy! I'm ready to set my old PC up again.....Can anyone answer this problem?