Oki ES2426dn Reference page 18

Matte
This option uses more Black and less CMYK while producing a
flatter black.
Separations
This option affects output only, allowing you to print all four colors as
separate plates.
Black Overprint
This option prevents registration errors and only works for 100%
black text.
Click the checkbox to enable the option.
Printer Halftone
This option prevents the halftone of a high-end graphics application
from printing.
Click the checkbox to enable the option.
Custom Gamma Adjustment
Not available.
Separations.jpg
BlackOverprint.jpg
Halftone.jpg
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