Use Grayscale Profile
[On], [Off]*
This setting allows you to define how device dependent gray data is processed.
[On]
Device dependent gray data is converted into CMYK data using the 'Grayscale Profile' of the machine. The data may be reproduced using only black (Bk) toner, depending on settings such as the 'Output Profile' or the 'Pure Black Text' setting.
[Off]
Device dependent gray data is reproduced using black (K) toner only.