QTR-Quadtone RIP

Thank you Lou and Jean for telling me that the 21 step random file can work and 
presenting your caveats. I will tinker and will get it done.

Looking at what I called the "Sample" files, I see that they are not in the same format as 
the files from my successful reading of the 21 step not-random step wedge. So I'm not 
sure what they're samples of.

Lou, FYI, the latest 2.5 Eye-One Read Me pdf says, "The 21x4 target is recommended for 
the best accuracy. I has 4 patches for each step value and the QTR software will 
automatically average the 4 measurements which gives a more accurate result." 

Thanks again.
Michael


--- In QuadtoneRIP@yahoogroups.com, "dewittehd" <jean@...> wrote:
>
> Michael, Lou,
> I just installed the update to Spyder3print and only spent one evening
> trying to get the right tone for my R1800. I have seen that the
> QTR-program refuses to linearise when either some values increase
> instead of decrease or, as Lou points out, the values of 80-85-90-95
> and 100% are to close so that the curve flattens. A good help is
> entering the data from QTR (or directly from your readings) in a
> spreadsheet and then let it draw a graph. You will immediately see if
> there are values out of order or if the tail of the curve platforms.
> This is a problem I have wher my values for 80 .. 100% are 30.25 28.72
> 27.5 27.43 27.36. You see that there is little difference and I think
> I might have to limit the amount of ink to below 70%.
> Lou, to assure you the program doesn't bomb.
> Regards to all,
> Jean
> 
> 
> 
> --- In QuadtoneRIP@yahoogroups.com, "Louis Dina" <lou@> wrote:
> >
> > Michael,
> > 
> > I always use the 21 step random target for linearizing in QTR and it 
> > works just fine.  The only time I have had problems was when shadow 
> > values were so close and bunched up that QTR decided they were too 
> > close.  If there are reversals, then it definitely bombs.  The 
> > solution in that case is to change the parameters and get more 
> > separation between shadow steps before trying to linearize.  That can 
> > be done in a number of ways.  
> > 
> > I felt that the 51 step wedge had too many steps for linearization 
> > and would probably make it even harder to get data that didn't have 
> > crossovers.  So, I always used the 21 step random file.  I use an 
> > EyeOne, but that shouldn't make any difference.  
> > 
> > If you get that error message when trying to linearize using the 
> > droplets, the I suspect your values are too close together at some 
> > point in the tonal scale.  
> > 
> > Hope this helps.
> > 
> > Lou
> > 
> > --- In QuadtoneRIP@yahoogroups.com, "michaelrosensf" <Michael@> 
> > wrote:
> > >
> > > I'm the originator of this thread, which has generated discussion 
> > about Spyder3Print. 
> > > However, my question has never been addressed.
> > > 
> > > I'll rephrase. Has anyone successfully used one of the random step 
> > wedges to linearize or 
> > > make an ICC profile by dropping the file obtained from reading the 
> > patches on QTR-
> > > Linearize-Data or QTR-Create-ICC? On a Mac?
> > > 
> > > I'm unable to get even the supplied sample files (e.g., QTR-51-
> > random) to work. I get the 
> > > message "Lab values not in order. Cannot Linearize" (or "Cannot 
> > Create ICC").
> > > 
> > > Help!
> > > 
> > > Michael
> > >
> >
>