QTR-Quadtone RIP

Sarah

The qtrgui help file says the following about the Ink Limit Adjustment 
Slider:

"Ink Limit effects the darkness of the shadows. Reducing Ink Limit can 
help unblock shadows"

I believe it controls the amount of black and possibly dark grey ink 
that is put down. In theory, if your curves are good, then you shouldn't 
need to use it but you might have certain images that might benefit from 
either lighter or darker shadows (although I would prefer to adjust them 
in Photoshop).

Another use is if you wish to use a curve that was designed for 1440dpi 
resolution that you wish to use at 2880dpi. The latter puts down a lot 
more ink so the slider can be reduced by a large amount to compensate.

You might also wish to try a paper that you don't have a curve for - you 
could use a curve for another similar paper but alter this slider if you 
find too much/too little ink is being put down. Evidence for too much 
ink would include mottling in the dark areas, the print being wet or 
reduction in dmax in the darkest areas. Evidence of too little ink would 
be overall lightness of print or not achieving the dmax that you would 
expect.

It's really one of those things you have to try out with a few test 
prints to better understand what it does.

regards
Howard

sagaface wrote:
> I posted this on the B/W group and received no repsonse, though someone 
> helpfully
> directed me here. I hope this question doesn't seem too "first grade":
> 
> I use a 2200 with Mac OS X, using K2/Eboni with either BO or QTR (with 
> which I am a
> complete beginner). I've read a few threads where people mention using 
> the ink limit
> adjustment with certain papers...how do you know which papers benefit 
> and by how much
> to pull back or add? I use mostly EEM/HPR.
> 
> I guess what I'm saying is I don't really understand the tool. Is there 
> someplace I can read
> about it someone could direct me to? I have read Roy Harrington's .pdf 
> for QTR and am
> still unsure when or why to use this.
> 
> Thanks for any clarification someone might offer!
> Sarah
>