QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, "Paul Roark" <paul.roark@...> 
wrote:
>
> Hi Colin,
> 
> I'd recommend you try the existing profile with just the ink 
positions
> changed and see if it works for you.

Paul. That is what I did last of all and the L values I put in my 
email was from that curve. (Apologies for my senior moment - I meant 
asymmetrical!)
> 
> >I have prepared QTR qidf files for HPR from your 3MK-Dmax-test 
> >through to re-linearizing using 67% and your 70% figure for the 
> >calculation of the end point;
> 
> It's probably unfortunate that my profiles use the 70 ink limit.  
That was a
> bit arbitrary and based on the very high loads I found I needed 
for some
> un-coated papers to hit their dmax.  Note that the real action is 
setting
> the end points in the curve creator -- at 38 for HPR.  So, 3 
channels at 38
> X 0.7 for an actual 26.6 per channel is an effective total ink 
limit of
> 79.8.
Yes, that is what I have from using your profile. 

> With the Windows Curve Creator and
> its curve preview this is easy to do.

I am using Win XP and it is easy to make the curve smoother at the 
right hand end. 

> (By the way, this system can also make the best Arches Hot Press 
(uncoated
> watercolor paper) image I've seen with an inkjet, attaining up to 
a 1.6 dmax
> with at paper -- rather high for an un-coated paper.)


I am in the UK and I know of no supplier for this paper.  Anyway I 
have stocks of HPR, Kayenta, William turner and Photo Rag Satin 
(horrible paper except for single chnnel BO - I haven't tried it on 
thr r1800).

I just need to know how to get the curve linear.

Colin  
> 
> Paul
> www.PaulRoark.com
>