I have a MPB 15" bought on the very day of release. I am now using it to edit photos for selling to various publishers. Do I need to get a monitor calibrator like the Spyder3 Pro? I went to this link to perform 'by eye' checks on my screen: http://www.imaging-resource.com/ARTS/MONCAL/CALIBRATE.HTM my monitor is uncalibrated, yet it passed the tests with the following scores: white test: 253 is distinguishable from white black test: 7 is distinguishable from black hue test: the two samples are clearly distinguishable gamma: standing back the middle grey matches the outside gray These tests were seemingly meant to show how bad an uncalibrated monitor would fare. However it came out very well. Is there more to the story than this? Do I need to get a Spyder?