Hey guys, for those of you who own cell phones that have the 'Auto Brightness' setting know what I'm talking about, but those who don't, auto brightness basically adjusts the brightness of your screen depending on what light setting you're in. Does anyone know if this is possible to do on an iMac? I think it'd be pretty useful for the screen to adjust the brightness itself depending on what time of the day it is/the environment you're in. Like right now, my screen is 100% bright and it's almost pitch dark in this room. I think adjusting it myself every time is pretty annoying.