QTR-Quadtone RIP

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@...>
> 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" <jkohn@...> 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@...
Black & White Photo Gallery
http://www.harrington.com