Calibrate two monitors to the same video settings

"It's likely not the interfaces--just like high-end microphones, the same assembly line turns out monitors with different temperatures, highs, and lows. And like those trinitron lines, if you're sensitive enough to notice the difference it's going to bug the heck out of you no matter what you do.

One option: You can use one monitor for visual tasks and one for more monotony--or have your tools on one screen and your main work area on the other. Then you don't have to have them matched.

Otherwise:

Get a test card up on both screens.

Keep the brightness and contrast near the middle when you start calibrating. It's a little muddier, but you'll be able to get it equally muddy at least.
Start by calibrating the temperature, if your monitors have that setting.
Then it's 100^2 X 256^3."

"With DVI, the signal is just 0-255 binary information for each subpixel. The monitor is set up to make a decent sRGB image of it with a 2.2 gamma by default.

With VGA however, the output can be controlled via software. the DA converter on the videocard translates every 0-255 value into a voltage on the VGA cable. Then the monitor converts the voltage back to a 0-255 subpixel value again. The ""output voltage curve"" can be controlled by programs like Adobe Gamma, or the Nvidia control center. Try fiddling with that, instead of the options on the monitor itself."