If I can help : please see below.
Olivier
--- In QuadtoneRIP@yahoogroups.com, "Mark Stracke"
<markastracke@y...> wrote:
>
> I'm having trouble linearizing an 1160 with piezotone inks. I get
the
> Ink Pattern printed well and have a limit to set in the curve I am
> making. The question is: how to determine the values I should enter
> for the three grey dilutions? I'm on a Mac..
>
I have the same setting except a 1290 and XP, I assume you use only 4
parts of grey on a 1190.
> When I try to linearize based on an included curve for piezo
inks I
> get an error regarding the densities not constantly increasing. The
> readings I get from my eyeOne do seem to be increasing throughout
the
> scale, sometimes only by .1, but they do increase. This error
problem
> is why I am trying to build my own curve from scratch.
This is the way I adopted too. So first look for a DEFAULT INK LIMIT
by measuring the darkest (densier) patch of the Ink Pattern with the
smallest % (you should be somewhere 60-70%). I decided to take the
habit to limit a little more than balck boost is the way later to
increase Dmax.
Reprint with Ink limit (slider pushed a bit on the right in the main
QTR window, see Tom's tuto for images)at the corresponding %tage.
Make sure to re-measure the K line from 100% to 70%, density MUST
decrease.
>
> I measured the max density patches on the other three inks.
The
> values are in L and converted to density. Do I use these numbers to
> calculate the entries for my curve? And if so how? Or am I totally
off
> base. Any help would be appreciated.
Now you can measure the 100% patch of the other greys and convert it
into a %tage of K. Here I'm just copying another post :
"
we are looking for is what would match 1.29 (the 100% light-black)
so in the black ramp we have: patch 40 is 1.22 and patch 45 is 1.33
imagine that we had intermediate patches 41, 42, 43, 44 -- which is
most likely to match the 1.29?
mathematically what you doing is: 5 levels (i.e 45 - 40) is a
difference
of 1.33 - 1.22 = 0.11 but we only want 1.29 - 1.22 = 0.07
so (0.07 / 0.11) * 5 = 3.2 levels i.e. 40 + 3.2 = 43.2
Or:
wanted-diff-levels = total-diff-levels * (wanted-diff-density /
total-diff-density)
3.2 = 5 * ( 0.07 / 0.11 )
"
Now quickly since you know : you set up your curve, Black Boost (110-
115% of default ink limit, Highlight (4)/shadows (8); overlapping
around 10-15% to have some dark grey ink with K...
Now print the stepwedge with this raw curve (you've named and saved
it prior to this) possibly at 108% to have large patches on A4 and
measure more easily, measure it, drop it to the linearize droplet,
reprint the now linearised stepwedge, remeasure with the eye-one,
produce the file (either from a PM5 .txt example or apparently in any
format with the latest version) to drag-drop to Create-ICC. And
you're done.
If I'm wrong somewhere (I do it from memory), someone will surely
point it out.
Save your qidf and icc files in a safe place, this is all you need to
re-create the curves and the results.
>
>
>
> btw, I have worked through this process before with the freeware Mac
> program on 10.1 and 10.2. I stupidly threw out my old version and
the
> curves that had worked so well when I installed the latest version
to
Show quoted textHide quoted text
> check it out. So I have some experience and have achieved success in
> the past.
>
>
> Thanks in Advance
>
> Mark Stracke
>