QTR-Quadtone RIP

Fred,

I had a little difficulty picking your new questions out of your post.  If I missed one you can 
re-post.

1.  Yes, you can use an existing descriptor file and fine tune by linearizing.
2.  You don't have to change the GREY_HIGHLIGHT and GREY_SHADOW values.  Most of the 
sample curves that come with QTR have both values set to 6.  Whoever created that curve 
must have felt it warranted the change.  I don't think they have much effect if you linearize 
properly, but I personally don't fiddle with these values, so perhaps someone else can 
comment.
3.  I assume that you have installed QTR properly.  You will therefore have a folder for your 
printer inside of Curvedesign/CurveDropBox.  All the curves installed for your printer will 
be present in this folder in a .quad form, and this is the folder that QTR will look in to find 
the installed curves.  To add an additional curve to this folder, drop the descriptor file 
onto Drop-Quad_Profile.app.  This will create the .quad file, and place it in the 
CurveDropBox in the correct printer folder. 
4.  You will now have a curve that has been linearized for your printer.

If you want, you can take it one more step.  Print the step wedge again - no color 
management from within PS, and WITH this new linearized curve from within the QTR 
dialog box.  Let the target dry.  Scan it with the i1 and MeasureTool.  This time, drop the 
text file generated by Measure tool onto QTR-Create-ICC.app.  This will create an icc file 
that you can use within PS for soft proofing.  Also, from within PS print with preview, select 
"Let Photoshop determine colors" and then select this new icc file.  You'll get top notch 
results.

Good luck!

Best.

Josh

--- In QuadtoneRIP@yahoogroups.com, fensys <fensys@g...> wrote:
>
> 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
> > >
> >
> >
> >
> >
> >
> > YAHOO! GROUPS LINKS
> >
> >  Visit your group "QuadtoneRIP" on the web.
> >
> >  To unsubscribe from this group, send an email to:
> >  QuadtoneRIP-unsubscribe@yahoogroups.com
> >
> >  Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
> >
> >
>