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This means that after switching off the display or after switching to a different memory scan mode, the value for contrast and brightness is restored to the calibrated position. - The calibrated position for contrast and brightness is determined by calibration of the video levels (see § 3.4 below). In case you feel unsatisfied with the current calibrated position, you need to repeat the calibration. The proper way to do this, is to use the automatic calibration routine. However, you can also man