Konica Minolta bizhub 181 - Manual (Page 77)

3 Specifying printer driver settings
3-34 GDI Printer Controller
Adjustment
Click the [Adjustment] button to specify the brightness and contrast.
Brightness Adjust the brightness of the printed image. A setting between -50
and 50 can be specified.
The larger the number, the higher the contrast and the more distinct
the image.
Contrast Adjust the contrast of the printed image. A setting between -50 and
50 can be specified.
The larger the number, the brighter the image.