QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
> To avoid the lighter ink firing at 100% you need to set the Overlap 
> figure to zero (on the Gray Curve tab). Your black boost figure 
should 
> then replicate the limit on the calibration print. I don't usually 
find 
> this is necessary but then I'm using grayscale inks which probably 
have 
> a darker LK.
> 
> Howard
>

Thanks, Howard.  

All my profiles have the overlap set to 0.  I agree, the black boost 
SHOULD replicate what I got on the calibration target, but it 
doesn't.  The final profile always has a Dmax that is lighter by 0.03 
to 0.05 density.  I kind of wish I could set the overlap to a 
negative number to move the light ink curves further to the left, but 
QTR doesn't seem to like that.  It always reverts back to zero.  I 
also tried setting the Shadow setting to a lower number in the Gray 
Curve tab, since this moves all the inks to the left and darkens 
everything in the shadow end, but that didn't seem to do it.

So, I remain suspicious that light inks may be stealing just a little 
Dmax, and the only way I can currently see getting around this is to 
create custom curves using the plot list, but I haven't tried this 
yet.  It may be easy, but it seems like a lot of work.  

Lou