Brightness/Contrast The brightness adjustment adjusts/regulates the background brightness relative to the black level of the screen. After the adjustments all grey levels (1-10% white) should be just visible. (Some graphic board drivers do not display the upper grey levels (1-5%)). When adjusting the brightness too high black parts may appear grey.     Contrast: The desired picture brightness can be adjusted with 'Contrast'. The contrast should be adjusted to the necessary brightness level without any burn out. A burn out appears as colour teared right edges of the picture.