QTR-Quadtone RIP

From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On Behalf Of Roy Harrington
Sent: Wednesday, August 09, 2006 3:36 PM
To: QuadtoneRIP@yahoogroups.com
Subject: Re: [QuadtoneRIP] Re: Profiling Epson R2400 using UC K3 inkset

The existing IlfordSmPearl curves are some very good template for
profiling
the R2400 (or any of the K3 printers for that matter. The ink limits
will all be
reasonable and the relative densities of K, LK, and LLK are already
done.
Although the full procedure is what I'd call top down, with existing
profiles its
often best to start at the bottom and only redo only the last step(s).

The warm profile is the simplest -- just K, LK and LLK. For different
papers
just delete the linearization numbers, create a non-linearized profile.
Then
print out the stepwedge, read the values, put into the profile and
re-create.
You're done. Graph the curves to see the idea. Unless a paper is
particularly
different -- needing more or less ink, this re-linearization is all you
need.

The next profile to understand is the "neutral-cool". Here the idea
is to
neutralize the warm K with C and M, and neutralize LK and LLK with LC
and LM.
See how this works in the Graph. If the tone is OK with you, just
re-linearize.
If you want to adjust color tone, do the highlights first -- adjust LC
and LM ink limits
depending on which way you want to go. Once the highlights are done go
to the
shadows by adjusting C and M ink limits. You don't need to be real
fussy with
this because at print time you can blend in the warm profile from
above. Error
on the cool side a little so you can blend with the warm. After the
color tones
are OK then relinearize.

Finally the two sepia profiles show two approaches for adding even more
warmth i.e. Y ink.

Roy

On Wednesday, August 9, 2006, at 12:08 PM, Kevin Bradford wrote:

> From: "Kevin Bradford" <bradford@catch32.com>
> Date: Wed Aug 9, 2006 12:08:29 PM US/Pacific
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] Re: Profiling Epson R2400 using UC K3 inkset
> Reply-To: QuadtoneRIP@yahoogroups.com
>
> Thanks for your reply John. I'll redo my curve using 100% LLK to
> black,
> then 100%LK to black and try again. My first attempt at printing the
> 21 step tablet with the "neutral" curve I was trying to create had very
> cool light tones and very warm dark tones. I was also using the
> Ilford neutral cool profile as a template and left in the linerization
> information when I created that profile. Perhaps I should wipe the
> slate clean and create the curve with no linerization.
>
> BTW, I am trying to profile Hahnemuhle Fine Art Pearl. When I have the
> process down I'll try profiling Museo Silver Rag. I too will share
> the
> results whey they are done.
>
> Kevin
>
> --- In QuadtoneRIP@yahoogroups.com, "jkohn_home" wrote:
>>
>> --- In QuadtoneRIP@yahoogroups.com, "Kevin Bradford" bradford@ wrote:
>>>
>>> I'm new to the QTR experience and dispite reading and re-reading the
>>> user guide I am not sure how create my first new curve. I've
> printed
>>;> and examined the calibration ink pattern page, but I'm not sure
> which
>>> 100% black, I should be comparing to which other black/gray ink.
> The
>>> example has two black inks, the R2400 has three.
>>
>> I believe you need to determine the density of LK and LLK relative to
>> black, as that's what you'll be entering into the density box in the
>> curve editor.
>>
>
>
-
Roy Harrington
roy@harrington.com
Black & White Photo Gallery
http://www.harrington.com