A while back I posted pictures I had taken on a vacation and someone commented that they all looked dark/underexposed. I looked at them on my work computer and agreed, but when I looked at them on my iMac that I used to process them, they looked fine. Since then i've noticed that I can process a photo to the point that it looks great on my iMac then when I look at it on my phone or another computer, it sometimes looks too dark or underexposed. I don't crank up the brightness level on my iMac screen. I generally have it below the halfway mark. How do I set my iMac screen brightness so that when I adjust the exposure level of a photo, it ends up at the right level. Is there any way to separate exposure from screen brightness? Are some screens are just inherently brighter than others? If so, how do I compensate for that? Does anyone else have this issue?