QTR-Quadtone RIP

Dear Roy,

again thanks, but let me add a question.

 From your descrition i understand, that always linearized Curves should 
be drawn on QTR-Create-ICC. But in an article of Paul Roark, Embedding 
Photoshop Curves in ICCs, 30.07.2007 i read "... The Create ICC program 
linearizes the system by taking the readings from the 21-step test strip 
and correcting for differences from the ideal distribution of 
densities." which gave me the idea, that the Create ICC itself will make 
the linarization. Is that wrong?

For better understanding what i\ufffdm trying to do a short description of my 
goal:
Sometimes i prefer to print BO instead of QTR and i thought, i could 
generate a profile for a paper/ink combination for BO-Printing by 
printing the step-wedge, measuring the densities, generating the profile 
and converting the image into the profile.

Seems that i actually don\ufffdt fully understand the linearisation process 
in this special case.

Best Regards and thank you very much for your continous support

Rainer Taube


Roy Harrington schrieb:
>
> Hi Rainer,
> The two programs QTR-Linearize-Data and QTR-Create-ICC are both 
> designed to
> take the same kind of input -- what you get out of QuickRead. So the
> problem
> is putting the output of one in to the other one.
>
> Since they are so similar it's easy to confuse the different purposes.
> The QTR-Linearize-Data is used in creating and linearizing a QTR
> profile/curve.
> This is done without any ICC profiling at all.
>
> Once you have a linearized QTR curve you may want to ICC profile it so 
> that
> the
> color management features of Photoshop can be used. You'll print out a
> completely
> new stepwedge with the linearized curve, read it with QuickRead and use
> QTR-Create-ICC.
> The resultant ICC can be used as a print profile and for softproofing.
>
> Roy
>
> On Jan 5, 2008 8:45 AM, Rainer Taube <rainer@... 
> <mailto:rainer%40tauberlin.de>> wrote:
>
> > Hallo,
> >
> > my name is Rainer Taube, i\ufffdm from Berlin, Germany. I didn\ufffdt work with
> > QTR for a longer time and now, trying to come back and understand again
> > how things are working, i found something that confuses me.
> >
> > 1. I printed the Step-21-gray.tiff with Photoshop, no profile assigned.
> > 2. I measured the Lab numbers with QuickRead which is still on my
> > machine and i find it useful.
> > 3. I exported the measured values
> > 4. I drew the file on QTR-Linearize-Data.exe
> > 5. The programme generates the ..._out.txt without error messages.
> > Looking in it, all seems to be fine.
> > 6. I drew th ..._out.txt file on QTR-Create-ICC.exe. An ....ICC is
> > generated without error messages. So far so good.
> >
> > ...
> >
> > Best regards
> >
> > Rainer Taube
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>