I have post my problem in other forum, but i am willing to see if anybody can really give me some advise. I just got my first mac, an iMac 24' 2 weeks ago, having playing with them a bit, I love it. today I spent quit a lot of time to process 20 images on my 24' glossy iMac. I shoot Raw, processed my raw files using Aperture, I then transfer them to Photoshop to do further editing, finallly embeded s-RGB save as Jpeg for posting online. they looked fantastic on my iMac, the color and sharpness are just wonderful. however , when I looked at them on my 17' 6 year old LCD, I was shocked by how terrible the color and sharpness they showed on that monitor. is this due to my un-callibrated iMac? before I purchased iMac, I always use my 17' to process images. it's not a very good monitor, but it produced at least similar color and sharpness of images when I looked at them in different LCD, this is what I am expecting my iMac to do the same or even better. Do I really need to invest in callibration tool? Is it possible ti share the same profile with somebody who also use the 24' callibrated iMac? btw, I don't do printing, all of my images are for web only. I have my iMac set to garmmar 2.2, any help will be appriciated. thanks in advanced!!