Originally Posted by BradF1979
Just installed it... I'm confused on why both yours and cors gamma looks great, but there is a noticeable difference. His makes my whites more reddish, and yours makes them more blueish.
Neither looks neutral then? Not really that surprising actually. Oh, and here's the reason why you can see similar "gamma values" on that website, but still see perceptual differences:
Gamma values specify the luminosity "curve" or, as simply as I can put it, how fast it gets brighter as you move away from black. Gamma doesn't affect the brightness of your screen; black and white are still the same brightness, it just affect the scale in-between them. There is no single gamma value, for white or for red, green, or blue when you're measuring it on your monitor; that website just helps you guess at an average of sorts. To get your gamma profile, you take measurements at a bunch of different levels ranging from all the way black to all the way white (or red/green/blue if testing gamma of a single subpixel instead of the combined grayscale gamma) and then you compare the SLOPE of each point (rate of increase of brightness at that point) to the slope at that brightness on the perfect gamma curve you are targeting (2.2 usually, 2.4 for dark movie settings). SO, you can see that gamma (expected slope) could be way off at any point, and maybe not so bad at another. There are serious serious limitations with calibrations done via that website, but it is the absolute best your're going to get without any equipment. Gamma and grayscale calibration serves a purpose, but it's not everything. It's really hard to comprehend all the ways a monitor can be "off", it's insane. Gamma only deals with luminosity, there's also saturation and hue, and those aren't really linear simple things either. So, combine them all and you will never be satisfied again, and never have a truly perfectly calibrated monitor. So, yeah a single averaged (and eye-balled) gamma value won't be able to represent the nuances of what you see. What'll really blow your mind is that my two monitors don't look the same even after each goes through really complex calibrations for 3hrs a piece. You'd think you could make them look the same, but you can't. That's why people still talk about IPS vs PLS vs VA and crap like that; if you could just calibrate away the differences, then you would!
Man, I just killed an internet tree on that long message. I really do try to keep these things short; I just have a blab problem.