I suppose the best thing to do would be fore everyone to adjust the monitor's gamma to the same level using the Adobe gamma corrector. That way we would see almost the same thing. The lightened picture looks good on my monitor.
Unfortunately, even individual web browsers can show colour differently. On my Mac, I like Opera best, then Firefox, when it's not falling over. But if I want to see an image accurately, I use Safari, as it uses colour profiles.
MS