QTR-Quadtone RIP

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
>