QTR-Quadtone RIP

The difference between photo black and matte black is that matte black is
laid down on matte paper as larger droplets because of the much greater
absorbency of the matte papers. When used on a glossy paper these droplets
become blobs and spoil the darks. Photo black is "stickier" and is laid down
as the correct size droplets on glossy paper.

 

From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
Behalf Of Tom Moore
Sent: Friday, January 25, 2008 1:25 PM
To: QuadtoneRIP@yahoogroups.com
Subject: RE: [QuadtoneRIP] Second request for help

 



> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com <mailto:QuadtoneRIP%40yahoogroups.com>
[mailto:QuadtoneRIP@yahoogroups.com <mailto:QuadtoneRIP%40yahoogroups.com> ]
On
> Behalf Of erichocinc

...

> I'm not able to develop my own curves at this point, so was wondering
> where there is a
> collection of QTR curves for specific papers, notably the Red River
> natural, the Lexjet version
> of enhanced matte, and various Hanemuele art papers.
> 

Since you're asking about UC black inks, I presume that curves you are
looking for are for UC ink as well.

The largest repository of curves comes with QuadtoneRIP when you download
it. Next there are curves in the files section of the Yahoo Groups pages for
QuadtoneRIP. Finally a number of users, notably Carl Schofield and Paul
Roark, have web pages that may have some additional curves. Although I don't
recall seeing curves for Red River natural, there may be an existing curve
for another paper that is sufficiently close as to suit your needs.

It seems to me that compared to other printers, the 4000 has quite a good
selection of curves, including a set for Hann. Photo Rag.

> I'm also wondering why there is no "neutral" curve for the Epson papers
> included with the
> QTR download.

Usually, where there is no neutral curve, the equivalent is achieved by
blending the warm and cool curves. The ratio required to achieve a hue you
consider neutral will depend on the paper you're using and your judgment of
what you consider neutral.

> 
> Finally, I'd like to understand the differences between the Epson UC2
> photo black and matte
> black inks. I am running an Epson 4000.

Aside from the obvious usage difference (Matte ink on matte paper, etc.) I
can't answer this.

Tom Moore

 



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