C5550 MFP User’s Guide
A guide to printing > 192
3. If using the PS driver, on the [Color] tab, click 
[Grayscale], and then click [Advanced] if you want to 
adjust brightness and contrast.
 PS Greyscale_oda.jpg 
Some applications will attempt to set the halftone screen 
information for the MFP. If the option to [use printer 
halftones] is left at ON, the MFP will set its own halftone 
screen value, giving a smoother result. It is recommended 
to leave this option on. 
[Optimized grayscale halftones] may take slightly longer to 
print but will give best quality.