QTR-Quadtone RIP

Hi - I am trying to create QTR profiles for Eboni 6 for Epson Hot Press Natural.  I am using an Epson 1400.

I am following the QTR user guide (Document Version 1.1 21 April 2005).

I am stuck on the second step where you need to determine the density levels of each of the shades of black.  My understanding is that I need to determine what each shade's density limit is relative to black.  To do  this, I look at the 100% shade of each ink and then determine where that  is on the black ink line.  The problem I am having is that each shades of black at 100% has the same density.  

I have uploaded scans of the ink calibration pages at:

https://picasaweb.google.com/davidcydsinai/QuadToneRip?authkey=Gv1sRgCP7RjIO7hby5Eg

These images were converted to RGB mode, but I am using Lab mode in PS.

Does something appear to be wrong with my calibration prints?

Thanks in advance for your help.

David

David,

**
>  I am trying to create QTR profiles for Eboni 6 for Epson Hot Press
> Natural. I am using an Epson 1400.
>

Be sure to download http://www.paulroark.com/BW-Info/1400-Eb6-Profiles.zip .
 Although even with these profiles, I recommend learning to do your own.


> I am following the QTR user guide (Document Version 1.1 21 April 2005).
>
> I am stuck on the second step where you need to determine the density
> levels of each of the shades of black. My understanding is that I need to
> determine what each shade's density limit is relative to black.
>

It's relative to the black printed at its ink limit.  (Often, maybe
usually, I find it best to have the dmax at a boost amount that is higher
than the ink limit, but to start don't worry about this.)



> To do this, I look at the 100% shade of each ink
>

No, what that other inks are at 100% is not relevant.  Look at their
densities at their ink limits.  The ink limits of the midtones are flexible
& subjective.  I use a double pair of reading glasses to inspect for
smoothness.  As the load increases there will be a point where the images
become blotchy.  The limit should be well below this point.  The shortcut
is to set the ink limits at the same as the black ink.  Lighter inks have
higher limits, so it's safe.  To hold the warmth down, I often run the Eb-Y
limit up rather high, however, then taper the others off.  I always want a
fair separation between the highest and next highest patches.  Don't go too
far up the decreasing slope curve.  As I said, it's a bit subjective.

I have an abbreviated QTR tutorial starting at page 11 of
http://www.paulroark.com/BW-Info/Eboni-4-Plus.pdf .  This is for a slightly
different version of Eboni-6, but it's all basically the same.  I use
Windows, so I'm not sure how much of this is relevant to Macs.

Good luck with the learning curve.  It's worth the effort.

Paul
www.PaulRoark.com



>
>


[Non-text portions of this message have been removed]

Thanks Paul.  This helps.

--- In QuadtoneRIP@yahoogroups.com, Paul Roark <roark.paul@...> wrote:

>
> David,
> 
> **
> >  I am trying to create QTR profiles for Eboni 6 for Epson Hot Press
> > Natural. I am using an Epson 1400.
> >
> 
> Be sure to download http://www.paulroark.com/BW-Info/1400-Eb6-Profiles.zip .
>  Although even with these profiles, I recommend learning to do your own.
> 
> 
> > I am following the QTR user guide (Document Version 1.1 21 April 2005).
> >
> > I am stuck on the second step where you need to determine the density
> > levels of each of the shades of black. My understanding is that I need to
> > determine what each shade's density limit is relative to black.
> >
> 
> It's relative to the black printed at its ink limit.  (Often, maybe
> usually, I find it best to have the dmax at a boost amount that is higher
> than the ink limit, but to start don't worry about this.)
> 
> 
> 
> > To do this, I look at the 100% shade of each ink
> >
> 
> No, what that other inks are at 100% is not relevant.  Look at their
> densities at their ink limits.  The ink limits of the midtones are flexible
> & subjective.  I use a double pair of reading glasses to inspect for
> smoothness.  As the load increases there will be a point where the images
> become blotchy.  The limit should be well below this point.  The shortcut
> is to set the ink limits at the same as the black ink.  Lighter inks have
> higher limits, so it's safe.  To hold the warmth down, I often run the Eb-Y
> limit up rather high, however, then taper the others off.  I always want a
> fair separation between the highest and next highest patches.  Don't go too
> far up the decreasing slope curve.  As I said, it's a bit subjective.
> 
> I have an abbreviated QTR tutorial starting at page 11 of
> http://www.paulroark.com/BW-Info/Eboni-4-Plus.pdf .  This is for a slightly
> different version of Eboni-6, but it's all basically the same.  I use
> Windows, so I'm not sure how much of this is relevant to Macs.
> 
> Good luck with the learning curve.  It's worth the effort.
> 
> Paul
> www.PaulRoark.com
> 
> 
> 
> >
> >
> 
> 
> [Non-text portions of this message have been removed]
>