QTR-Quadtone RIP

Walt

Thanks for your very helpful reply.  Of course I should have just
considered the message literally, but it seems almost too obvious
somehow!!  

The paper is indeed HPR.  I'm pretty committed to it.  Not
particualrly interested in the Epson papers, for a whole host of
reasons, so I would like to find a solution.  I also use Torchon
pretty extensively.

> So your choices are:  linearize the printer with QTR; 

By this, do you mean print with QTR and linearise its curves?  Happy
to do this but am waiting on curves for the 7800 which don't appear to
exist yet (QTR 2.3.1, PC).  I presume I can create my own curves but I
thought I'd leave it to the experts!  I suppose I can still create an
ICC profile with QTR-create-ICC once those curves are in place and
linearised, and then I have the best of both worlds perhaps.  I find
soft-proofing to be pretty much essential!

try different 
> ABW settings (I find the light setting more linear than the darker 
> setting)

I will try this, thanks - I take it the end points (ie dmax/dmin) stay
the same, it is simply the ramp (curve) inbetween that changes - ie I
won't lose DMAX by using 'light' over 'dark')

> or manually adjust the 
> numbers in the text file to make them just linear (e.g. if they are 
> 15.35, 15.90 and 15.40, change them to 15.35, 15.34 and 15.33).  The 
> latter option is a bit of a cheat and will reduce the shadow 
> linearity and separation, though I'm not sure to an extent that is 
> visually detectable.  Incidentally, I have *not* found that reducing 
> the ink limit (in the ABW driver) corrects the reversal problem.

It take it that others potentially have from the way you say this?



Thanks again for your helpful reply

JD








> 
> 
> --- In QuadtoneRIP@yahoogroups.com, "jdaalder" <jdshop@h...> wrote:
> >
> > Hi
> > 
> > I've got an Epson 7800 and an Eye One unit and I'm trying to use 
> QTR's
> > create ICC program (on Windows XP) to create an ICC profile for the
> > ABW mode.
> > 
> > I've printed the step wedges (51 grey random) with no colour 
> management.
> > 
> > I've used measure tool to measure the patches (in reflective mode, 
> no
> > spectral).
> > 
> > However when I drop the .txt file on to QTR-Create-ICC.exe, it 
> always
> > gives me a .txt output file saying 'Lab values not in order, cannot
> > create profile'.
> > 
> > I'm sure it is something obvious but I can't figure out what is 
> wrong,
> > nor can I find anything obvious in the eye one notes or the two 
> yahoo
> > groups.
> > 
> > Thanks for any help!
> > 
> > Cheers
> > JD
> >
>