B9180 B&W Printing
That'd be the settings in Photoshop having a different gamma or dot gain depending on color space.
You're best to just use Let Printer color manage, then in the driver select print as greyscale, then select grey inks only if on media that accepts these settings.
Neil Snape photographer Paris http://www.neilsnape.com
|Chicago Alley by tko|
from Down the alleyway
|Callan-5680 by vbuhay|
from What Child's Dream May Come
|Widget by Wilfried HKG|
|Oxbow Bend by stickpointed|
from Landscape - Colour #2