Digital BW, The Print

Alessandro Pardi <alessandro.pardi@i...> wrote:

> All I can say is that I first tried to modify the global RGB curve, 
but that
> caused banding, whereas changing the Red curve gave no banding in 
the
> various trials I ran.

Alessandro:

Yes, the Red curve controls the Cyan postion ink (which is the dark 
gray in the FS and Piezo systems) so adjusting it is the best way 
change the dark end.  You can't directly control the Black ink -- I 
think the driver automatically turns it on when each RGB values is 
below about 50%.  Paul Roark may want to step in to correct or add to 
this.

Using any combined RGB transfer function curve to adjust the output 
really defeats the purpose of a Partitioned workflow -- a meat axe vs 
scapel.  Note:  the Green curve controls the Magenta position ink 
(medium gray) and the Blue curve controls the Yellow position ink 
(light gray).  Adjusting each separete RGB curve is how I built the 
partition curve.

Thanks.

Jeff Randall