QTR-Quadtone RIP

Jason, You might try lowering or 0'ing the boost value as well. If you
are already using a K limit at the maximum the paper can take without
reducing density( the turnover you mentioned), putting the boost at a
higher level might put more ink down than you want in the lower
values. Ostensibly, it isn't supposed to affect anything other than
the 100% patch but my experiences have given some question to that.

Another thing you might look at is to try the overlap value at O as
well. Since you are duplicating the C&M curves and both are then
overlapped with K, it's putting a lot of dark ink down. Likewise, you
may have your limits for the medium and light inks at too high a
level. Try moving down on your curves to a point just before they
start to nearly level out and set your levels and densities from those
points. There is no reason why you shouldn't be successful with your
inkset.

As a last resort, you might start with using just 3 of the inks(K,C,Y)
to make your curves and when that is OK add the others in one at a
time while modifying the limits etc of the equal density ones until
the curve again is balanced. It might also be that you are seeing
visual effects caused by dot size variation algorithms  programmed
into QTR. Your inks are all fairly high densities so perhaps are
impacting the change points for dot size in the curve creator in some way.

Unless I'm mistaken, the use of multiple inks of the same density is
relatively new to QTR's use, so making the automatic curve creator
work well might require a bit more than the general tutorials
recommendations provide. P. Roark does this in a different way by
using Create Icc  and embedding curves. You might check out his site
for tutorials on his methods.

Regards,
Duane
 


--- In QuadtoneRIP@yahoogroups.com, "Jason" <hirsch@...> wrote:
>
> Thanks very much Duane-
> 
> I took your advice and remapped the curves.  For the first time I
> actually have a 'grey' value, but unfortunately immediately after the
> 10 patch we're back into the blacks.
> 
> I'll keep digging- I had hoped to use some of the BO only curves as
> supplied with QTR but none of them help me with the more refined
> portions of the greys.  Right now I have white, dark medium grey, and
> black within 20% on the 21 step wedge.
> 
> Jason
>