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Try your backlight in the middle for this also. Put your contrast/white level on max setting when you do this. Next: Run the Windows Color Calibration (just go to search bar on your PC and type "color calibration"), or test disc calibration, whatever you usually use, for brightness/black level first. I turned off almost every extra feature in the settings personally - motion correction, color correction, blah blah all off. has a calibration guide you can run before running the device calibration. Put TV in "movie/custom/game" mode whatever you use the most, depending on device. Device hooked up and load the X-Rite software that comes with (or from website). Now, here's my run through of TV calibration experience. Can't recommend this enough for this purpose - blew me away. You basically just run the software without changing anything for basic calibration and it's flawless and really cool. It made three monitors I have setup together, which all looked different out of the box, all look perfectly matched. I even did my old Windows phone - as long as the device has tweak-able picture settings it works! After using it, I found that it actually has two "stages" of calibration, first one that does indeed work with anything connected you use, Xbox or otherwise, not just PCs, since you actually adjust the TV's picture settings on the TV itself while the device reads real-time. I was skeptical doing a home theater TV (vs a PC monitor) since the X-Rite software actually adjusts with the Windows Color Profile at the OS software level, which would not work for a TV connected to Xbox. Was steered toward the X-Rite i1 Display Pro, which I bought and love. I posted about this not too long ago - asking about a home theater TV calibration device instead of just a disc.
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