QTR-Quadtone RIP

Jim

You don't say it explicitly, but I infer you are using MIS colour inks, not
the Quad inks. 

> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of Jim Thyer
> Sent: Saturday, September 01, 2007 9:33 AM
> To: QuadtoneRIP
> Subject: [QuadtoneRIP] Ilford Smooth Gloss-MIS ink
> 

...

> When I print the Ink Separation test page and check the densities of the
> black I find, plotting the result, the curve has 2 straight sections
> intersecting just under 50% black.  There is little increase in density
> above this point. (1.91 at 45%, 1.96 at 50%, 2.02 at 55%, and from 60-100%
> increasing only from 2.04 to 2.12.)
> 
> It is easy to measure the LK ink max density as equivalent to 24% of the
> Black.
> 
> Am I correct in saying the Default Ink Limit for my 2100/2200 printer with
> MIS Universal Black ink is maxing out at 50% level, rather than the 80-90%
> level suggested on P13?
> 
A dmax of 1.96 (or even 2.12) seems low for a glossy paper. Perhaps that is
the nature of the Universal K you are using. In any event, I would try using
55% as the default ink limit and then try squeezing out a little more dmax
using Black Boost.

> I am also puzzled by the UC-Neutralizer option given in some of the sample
> files, especially as I can find no reference to it in the paper, or in any
> of the other papers I have found.  Having listed all the parameters in the
> QIDF files I see that this term sometimes occurs and the terms
> COPY_CURVE_LC=LK and COPY_CURVE_LM=LK are omitted.

The UC_Neutralizer is an artifact found in older curves. Ir has been
superseded by Copu_Curve_from, which is more general.

> 
> I have used a table listing all parameters in the QIDF files for the

...

> 
> Jim

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