Digital BW, The Print

Carl,

I did some more experiments using the 1280 values. Even when the
endpoint of the LC curve moves to 16% I can still see dotting from the
LC ink between 15% and 30% on the stepwedge. I also got the same problem
with the overlapping of the inks as I had with my original values. The
only thing that fixes the problem is setting GRAY_OVERLAP to 50 or
higher.

Except for the dotting in the highlights I managed to get what appeared
to be good looking stepwedges using my original values and a
GRAY_OVERLAP of 60. Unfortunately, making prints with real images rather
than stepwedges revealed some posterization.

I strongly suspect that the postscript driver I'm using is interfering
again, since I get such poor results and because the values I'm getting
are inconsistent with yours. The MIS LK ink is supposed to match the
density of the original Ultrachrome ink.

--
Daniel Staver
http://daniel.staver.no 

> I made a couple of test profiles by first modifying Roy's 
> 1280_VM_gray 
> file as one example of a UT 2200 profile (no toner) and also used the 
> values you gave in an earlier post for the second sample UT 2200 
> profile.  The two curve plots and corresponding profile descriptor 
> files are below.  I can see your problem with the LC curve extending 
> too far down and as Bill Morse suggested you might want to 
> try lowering 
> the partition values to something more like Roy's values for the 1280 
> profile to keep the LC out of the highlight area.