QTR-Quadtone RIP

Greg <gregnixon@...> wrote:

> **
>
>
> ...
> K is MK not PK. The paper is Epson Archival Matte.
>
>
> "Keep in mind that, in the QTR partitioning, the inks in a progression must
> be different densities."
> The progression is the grey step wedge? which would mean that I can't use
> both M & C in the printer, as they are the same density.
>

If you are making a QTR profile, the partitioning phase will put the inks in
order of their density.  If 2 are the same, the system does not work.  You
can use the inkset, but you have to partition one "channel" at a time.  So,
for example, work up the Y, LC, C, and K channel as the "gray" inks.  Have
the M and LM turned off, that is "not used" in the Curve Creator.  Then add
the M and LM in a "toner" channel that uses the full Y, LM, M, and K, can
probably have the exact same curves (slightly different helps spread the
cross-overs), and splits the ink limit between the two channels -- manually
done.  (I'm sorry if this gets a bit complicated for someone just starting
out.  Note that the Epson driver and Create ICC can probably get you a good
print much faster.)

(Are you using Windows or Mac?  I use Windows and Curve Creator GUI.  How
 what I do is done in the Mac world will have to be handled by someone
else.)



> I used a profile .qidf from the 1290 set UT2 Enhanced matte Carbon (I
> think) parsed the text and then renamed, filled in the values etc.
>

Using a profile for a different inkset and different printer is chancy.
 Nonetheless, have you tried just linearizing this to see if it's within the
range of what the program can handle?  The fact that the pre-linearized (you
cleared the linearization tab, I assume) 21-step is dark might be totally
cured by the linearization step.  What it requires is that there is some
minimum separation between the steps.  It cannot handle posterization.
 However, smoothness of the curve is a better predictor of success with
linearization than the mere fact that the pre-linearized print is too dark.

Paul
www.PaulRoark.com


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