Oki MC560n User Manual page 188

2. On [Black Finish] (2), make your selection: [Auto] (allow
printer to choose the best method depending on page
content), [True Black] or [Composite Black].
Graphic pro
1. On the driver's [Color] tab, select [Graphic Pro] (1) and
click the [Options] button.
PS Black Generation 2_oda.jpg
2. From the [Black Finish] menu (2), choose your preferred
setting.
A guide to printing > 188