QTR-Quadtone RIP

Maybe some of the advanced users of QTR can shed some light regarding linearization.  
Currently printing on a 7600/UC/Windows.  

After building the initial separations for L and LK, I read the patches and notice that 
eventhough there is a gradual change in each patch from paper white to ink black, I do have 
a bit of a flat spot in the three quarter tones and not enough separation between 95% black 
and 100%.  I load the measurements into the Linearization tab and create a new curve.  I now 
print a new 21-step wedge and notice that the steps are more evenly spaced, no flat spots 
and separation between 95% and 100%.  All looks good.  

The question I hope to get answered is:  What is QTR Linearization or What is QTR Linearizing 
to?  Does the program just create even steps between paper white to DMAX?  Or does it 
Linearize to a specific Gamma like 2.2?  If I'm editing in a Gray Gamma 2.2 space, should I try 
to create a QTR ramp that matches the same ramp as Gray Gamma 2.2?

Hope some experts can shed some light.  I just want to understand this linearization process 
a bit more clearly.

Hi,

Being new to QTR, this is one of my questions as well. Very surprising
that nobody is answering this question ... we're supposed to be on a
QTR forum, right?
As this is one of the basic items on this rip I thought the
experienced users could tell us all about it...unfortunately it seems
that this is not the case.

Grtz,
herman

The QTR linearization adds a correction curve so that the steps in the wedge
are evenly spaced by "L" value (i.e. Luminosity of Lab).  This is
different that the
various gammas, dotgains etc.  Since all the QTR profiles are
linearized the same
way there are some generic ICC profiles (QTR Gray Matte Paper and QTR Gray Photo
Paper) that can be used for printing that will match your embedded profile.

If you want to go to the next level after linearizing your QTR
profiles you can make
custom ICC profiles using a similar method but with QTR-Create-ICC.
This way you
can also get softproofing in Photoshop as well.

Roy

On 8/30/07, rip_id2857 <rip_id2857@...> wrote:
> Hi,
>
> Being new to QTR, this is one of my questions as well. Very surprising
> that nobody is answering this question ... we're supposed to be on a
> QTR forum, right?
> As this is one of the basic items on this rip I thought the
> experienced users could tell us all about it...unfortunately it seems
> that this is not the case.
>
> Grtz,
> herman
>
>
>
>
> Yahoo! Groups Links
>
>
>
>