QTR-Quadtone RIP

Hi Joost!

Thanks for your answer...

Is there perhaps somebody who can answer my question 2???

Or where can I find some more docu about creating curves?

CU

Peter


--- In QuadtoneRIP@yahoogroups.com, "Joost Horsten" <j.h.j.h@...> wrote:
>
> --- In QuadtoneRIP@yahoogroups.com, "grayscale2008" <pm2003@> 
> wrote:
> >
> > Hi guys!
> > 
> > I am new to QTR 
> 
> Welcome!
> 
> > and I am trying do create some curves for my EPSON
> > 2100 using Hahnemühle Photo Rag with the original UltraChrome ink.
> 
> Frankly, I thought these curves were already shipped with QTR but I 
> checked and indeed they're not. You may try the the Epson Enhanced 
> Matte curves though as EEM is rather similar to Photorag.
> 
> > Here are my questions:
> > 
> > 1.) I want to linearize my curves now. Which file for measuring 
> should
> > I use? 
> > 
> > There is a "21step.tif" in the "QTR"-directory and there are several
> > Step-21*.tif files in the "Eye-One"-directory.
> 
> From a fundamental point there's no difference. It depends how you 
> want to proceed. This is how it is with an Eye-one and Measuretools 
> download from the Gretag-MacBeth website (URL is in the QTR doc):
> 
> The "21step.tif" and the "step21-gray" are both single sequential 
> stepwedges. I always use a modified version of the 21step.tif as I 
> can easier align me Eye-one on it. But then I tell Measuretools I'm 
> using step21-gray.
> 
> Step-21-random is meant for a line scanning mode in Measuretools. 
> Instead of measuring the 21 areas one by one it should be possible to 
> have one single movement over the step wedge. Measuretools in then to 
> detect the transitions between the areas. Therefor neigbhoring areas 
> must have sufficient contrast, not true for the sequential step 
> wedge. However, I've never been able to get this feature to work 
> well. So I just have a manual process. So  use the sequential one.
> 
> The setp-21x4-random allows for four measurements thus averaging out 
> noise.
> 
> As matter of fact, I do have made a sequential QTR-21x4-gray.txt file 
> (the input files that measure tools reads) to allow for the averaging 
> over four measurements using the sequential stepwegde.
> 
> So all and all, it's 1) mostly personal preference 2) depending if 
> you want to add accuracty by averaging out some noise.
>  
> > 2.) Which file should I use to create a icc profile?
> > 
> > There are 3 exe-files in the "Eye-One"-directory:
> > 
> > QTR-Create-ICC.exe
> > QTR-Create-ICC-RGB.exe
> > QTR-Create-ICC-RGB-bpc.exe.
> 
> I'm afraid I can't help you on this one as I don't use them
>