QTR-Quadtone RIP

Josh,

Thanks a lot for your help and patience.
As you may have guessed I'm trying to linearize an already existing  
curve, following the method below (found in the Eye-one-readme file) :

"Linearize a QuadToneRIP Curve

The Linearization process is simply creating a correction curve using  
the above
data to straighten the L data graph. To use this feature, simply  
create the ink
description file, doing the partitioning. "

 > can I use an existing ink description file here, and simply delete  
the LINEARIZE line before I proceed ?
 > I only want to fine tune an existing curve for the R2400 and UC inks.

"The GRAY_HIGHLIGHT and
GRAY_SHADOW fields can be approximated at 4 and 8 respectively."

 > do i need to follow this advice if I'm working on an already  
existing file (where different values are filled) ?

"Make the
quad curve and print out the Step-21-gray stepwedge, and measure as  
above."

 > well... actually, how do I make the quad curve from the ink  
description file ? Drop-Quad-Profile ?
 > I guess I have to install the new quad curve before printing ? Run- 
Install-Curves is the way to go ?

"The last line has the linearization info. Triple-click on it, Copy  
the whole line and
Paste it to the bottom of the ink description file. Re-process the  
ink file with
Drop-Quad-Profile. "

 > and I should end up with a new linearized curve I have to install ?

sorry for the FWOB, I'm really confused, and christmas' excess don't  
seem to help me grab the whole thing.

best,
fred


Le 24 déc. 05 à 17:54, joshhackney a écrit :

>
> Fred,
>
> I assume if you are printing the 51 step wedge that you have  
> already finished your ink
> limits and partitioning, or you are using a curve from someone else.
>
> I'm not sure if you are trying to linearize your curve, or create  
> an icc profile using QTR
> Create ICC.  If you are trying to linearize, make sure there is no  
> linearization data at the
> bottom of the curve file - just delete the whole linearization  
> line.  If you are trying to
> create an icc file, just proceed to the next step.  If you have no  
> idea what I am talking
> about, try rereading the documentation.
>
> Now, open the 51 step random target within PS, print it with "No  
> color management" from
> within CS2, or "Same as Source" from older PS versions.  Within the  
> QTR setup screen, do
> NOT select calibration - select the curve you have created (or  
> downloaded).
>
> You can scan it right after printing, but I have found that you  
> really need to allow the
> target to dry overnight to get the best results.  Within  
> MeasureTool, select "51 step
> random", it will ask you to place the i1 on the calibration target,  
> and after the calibration,
> the dialog will pop-up.  Select "strip with no gaps", and scan  
> away.  Once you save the txt
> file, go to Finder.  Drag that text file and drop on "Drop- 
> Linearize-Data.app" if you are
> trying to linearize, or drop it on "QTR-Create_ICC.app" if you are  
> trying to create an icc
> file.
>
> Good luck!
>
> Josh
>
> --- In QuadtoneRIP@yahoogroups.com, "fred_h67" <fensys@g...> wrote:
> >
> > Hi all,
> >
> > I'm giving this process a try with QTR 2.3.4 on a Mac (printer is a
> > R2400 with UC inks).
> >
> > Following the instructions in the Eye-One folder, I started to print
> > the 51 steps wedge. There were no particular instructions so I tried
> > to print without CMS and selected the quadtone calibration mode  
> in the
> > settings...
> > IMHO this must be wrong cause I get a colour wedge, and the i1  
> reports
> > "too many errors" when reading the strips (I guess it expects a
> > greyscale one like I do).
> > So what printer settings should I use to print this wedge ?
> >
> > Thanks in advance - and please accept my apologies if this has been
> > discussed already, I didn't manage to find a similar topic in the
> > group though.
> >
> > Fred
> >
>
>
>
>
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