QTR-Quadtone RIP

Thanks, Paul, for this and your previous post.  Your experience with 
IJC seems to suggest light inks (or even additional dark inks, such 
as C or M) can and sometimes do reduce the Dmax, especially if the MK 
ink is already at optimum ink density and there are no small white 
voids in the printed pattern.  Like you, I have adopted 2880 dpi, 
unidirectional, ordered printing for all my QTR profiles, which seems 
to give me better results.  

I am toying with the idea of generating a series of neutral, warm, 
sepia and cool curves for one specific paper based on using the plot 
list as you have done in some of your profiles.  I will be using the 
MISPro color inkset.  I am hoping that most papers respond the same 
to the <b>"ink relationship"</b>, so that I can simply adjust the 
overall ink limits and relinearize when I migrate from one paper to 
another.  So, theoretcially, a neutral QTR profile on my initial 
paper will still give me neutral results on new papers using the same 
plot list (ignoring the color of the paper base, of course), and I 
would just have to change the overall ink limit so it is appropriate 
for the new paper (whether matte, luster, or whatever).  This is may 
be wishful thinking.  If it works, though, it would sure make profile 
creation easier, and possibly even more repeatable from one paper to 
the next (ie, all sepia profiles would tend to have the same 
coloration).  And yes, I still believe in Santa Claus.

Any thoughts or experience you have on this would be appreciated.  If 
it works, I can quickly generate great profiles, plus make certain 
that I don't have ANY light inks in the deepest shadows, thus giving 
me the better Dmax I seek.

Regards, Lou


--- In QuadtoneRIP@yahoogroups.com, "Paul Roark" <paul.roark@...> 
wrote:
>
> When I was using IJC quite a bit I got suspicious that the smoothing
> algorithm was putting some light inks in the 100% patch even though 
they
> were supposedly at 0 at that point.  I could "see" from the IJC 
graphs that
> the final line (to the extent it was accurate) did not always go 
through the
> point.  To counteract this I moved the point at which the light 
inks hit the
> horizontal axis a little to the left of the 100% right edge of the 
IJC
> graphical interface.  It seemed to work.
> 
>  
> 
> Paul
> 
> www.PaulRoark.com <http://www.paulroark.com/>  
> 
>  
> 
>  
> 
>   _____  
> 
>  On Behalf Of Louis Dina
> 
> 
> 
> All my profiles have the overlap set to 0. .
> 
> So, I remain suspicious that light inks may be stealing just a 
little 
> Dmax, . 
> 
> 
> 
> [Non-text portions of this message have been removed]
>