The variations in the ambient light environment, the hardware capability of the TV to show deep shadows and bright highlights, creative lighting/editing choices in particular scenes, and personal preference all make far more difference than fine calibration. Playing around with fine calibration requires a high-quality color meter, and probably wouldn't produce significant improvement for most people. The digital content from all sources gives you the unaltered video values that the producer intended. The TV is roughly calibrated at the factory to give you the standard screen appearance with standard digital input values. It made some sense in the days of analog video inputs, but now the only value is to run the examples that show you the independent effects of the different controls. I think the time for TV calibration software has passed.
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