That gray is #737373 which is in the darker half, though not by much and the background is full white. People's vision varies, but it might be worth a check at

That gray is #737373 which is in the darker half, though not by much and the background is full white. People's vision varies, but it might be worth a check at a black and white gradient with your display to see if it is wonky. I keep one from the bad old days of CRTs at http://jim.studt.net/bw.gif http://jim.studt.net/bw.gif if you want to take a peek. If you see wide, uniform areas then your display needs work. (As does my gradient, now that browsers have a white background by default. You can't tell if there is a flat spot on your righthand edge.) It helps to make a little circle say 1/10th the width of the image with your hand, and look through that. See if each section looks like a gradient in isolation. Your brain lies to you a lot.