Digital BW, The Print

Daniel,

Are you seeing this highlight dotting without using a loupe?  I'm only  
using the Epson UC K, LK and LM and LC inks for toning with the 2200  
and I can only see highlight dotting with the aid of a 4x loupe.  Is  
the density of the UT LC position gray ink greater than the Epson LK  
ink?

Carl
On Sunday, August 10, 2003, at 09:18  AM, Daniel Staver wrote:

> 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.
>
>
>
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