QTR-Quadtone RIP

Duane-

That did it.  Well, at least, I now have discernible density up to 50%
(not a correct tone scale, but I can see into the blacks up to that
level).

It looks like I need approximately another 75% reduction in levels to
create a completely graduated tone scale.

So it would appear if I'm going to want to mix my inks to keep
consistent usage I'm going to have a heck of a time using such small
numbers (division by 2x and 3x for each ink).

The next step will be to further refine how much ink is being put
down.  *sigh* This was never so difficult at work.  Print the patch,
read it in, spit out the profile.  Repeat.  I must have been spoiled ;)

Jason

--- In QuadtoneRIP@yahoogroups.com, "dlruckus" <dlruckus@...> wrote:
>
> 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
> >
>