QTR-Quadtone RIP

Howard, I'm an plonker.  I was indeed printing at 2880.  When I went
back to 1440 all is OK.  I don't get more than 1.6 dMax at the moment
but thats OK - will move to K6 or a K4+toner solution sooner rather
than later now that I have overcome most of the dumb mistakes.

Thanks indeed for your help and patience,

--Kip


--- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>
> Kip Cole wrote:
> > Howard, thanks for the advice.  The ink limit in the HPR curve I've
> > been working from is 75%.   When I measure around that point on a the
> > ink limit calibration chart at 100% I get:
> > 
> > Step     L*
> > 50       17.5
> > 55       17.8
> > 60       18.2
> > 65       18.4
> > 70       18.6
> > 75       18.8     ==> Chosen as ink limit
> > 80       18.8
> > 85       19.0
> > 90       18.8
> > 95       19.4
> > 100      19.5
> > 
> > As you suggest, the 75% step is very close to the 80->100 steps, and
> > the 70% step too.
> > 
> > Based on this data, what ink limit would you try as a base.
> > 
> > Cheers, --Kip
> > 
> Kip
> Those figures look a bit peculiar - they seem to go backwards which 
> would indicate over-inking. Are you printing at 1440 or 2880dpi? If at 
> 2880 you may want to drop the limit even more than the 55% you have 
> suggested in your other email. I don't use the UC inks but I would have 
> thought you should be able to achieve a better dmax than 1.59 on HPR. 
> Eboni ink typically gives 1.68-1.72.
> 
> regards
> Howard
>