The calibration sets up the optimal setting for the current viewing envirioment.
For example, if this set is in your living room mounted in the center of the wall, and the set is calibrated at noon on a sunny day, the set will have the best viewing at noon on similar day. Any light in a room will change how the picutre is viewed. Professional Calibration is best for those who have a home theater setup without any exteranl light present in the room.
You can change between the setting with the Aspect/Format button on remote for preset settings.
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