Press the [User Tools] key, and then perform automatic gradation correction.
[Maintenance: Image][Auto Image Density Adjustment & Colour Calibration][Adjustment and Calibration] Select the resolution for which you want to correct the color gradation [OK]
The resolution can be selected from 600 × 600 dpi (1 bit), 600 × 600 dpi (2 bit), 600 × 600 dpi (4 bit) or 1200 × 1200 dpi (1 bit).