I have (only for now) 2 late 2008 macbook pro. One has a really nice screen, great contrast, rich colors. The other is the opposite, poor contrast, any image looks flat and pale. I suspect one of the reason is that there is a significant difference in black level between these two MBPs. So I compared the 'black' of the 2 screen in a darkroom (my bathroom ) and below are my test photos: (About how photos were taken: Difference of the 2 screen is already apparent to me with normal viewing angle, but to emphasis the difference in the camera, I used a high viewing angle.) photo 1 (see attachment) is the screen with pure black background. One can easily see that the right one is much more black than the left one. photo 2 is to compare the 2 screen with dark picture on it. Yes, the night sky looks more beautiful if the black level is good. photo 3 is to compare a normal (non-dark) picture. I compared a number of pictures generally the right one has better color levels. The one I am showing here is a good example for green: You get a better green with better black level. I am not a photographer, but taking photo is my hobby. And like everyone I want photos and movies look great on my MBP. Just a little worried that the quality of the screen can vary so much. Do you know any software can measure the contrast and black level of the screen? would be interesting to try on both machines.