QTR-Quadtone RIP

I've been trying to get the PK ink for my R800, Ultra Luster paper,  and a "correct" amount of the Gloss Optimizer to reduce bronzing.  I've used numerous combinations including 90% limit of the GL OP and a 60% limit of the PK ink in the QTR Curve Creator...still getting noticeable bronzing.

When printing from the Epson drivers, I don't get the bronzing (but don't like the tones and want the QTR control)...so they must have figured out a correct balance of Gloss in the ICC profile.

Does anyone have an idea how to solve this...any way to "look" at an ICC profile and see the mix of inks, etc?...or other combinations to try with QTR?

Thanks,
Terry

You may find some relevant info in this thread of a month ago:

http://tech.groups.yahoo.com/group/QuadtoneRIP/message/7894

Joost

--- In QuadtoneRIP@yahoogroups.com, "Joost Horsten" <j.h.j.h@...> wrote:
>
> 
> You may find some relevant info in this thread of a month ago:
> 
> http://tech.groups.yahoo.com/group/QuadtoneRIP/message/7894
> 
> Joost
>

Thanks Joost,

Very helpful for ideas to try...I hadn't searched for GLOP or GO and now see may references to that in the posts.

Terry

--- In QuadtoneRIP@yahoogroups.com, "firstlight2001" <TerryGls@...> wrote:
>
> --- In QuadtoneRIP@yahoogroups.com, "Joost Horsten" <j.h.j.h@> wrote:
> >
> > 
> > You may find some relevant info in this thread of a month ago:
> > 
> > http://tech.groups.yahoo.com/group/QuadtoneRIP/message/7894
> > 
> > Joost
> >
> 
> Thanks Joost,
> 
> Very helpful for ideas to try...I hadn't searched for GLOP or GO and now see may references to that in the posts.
> 
> Terry
>
I've worked my through the points Joost mentioned in the thread above and have figured out how to add the Gloss Optimizer, aka GO or GL or GLOP as I often see in the posts.  I'm working with a R800 and std Epson ink set.

The key points for me were: (I'm using a PC)
1-Change image file (step wedge in my case) to no 255 highlights...otherwise the GLOP does not cover any 255 tones.  Just take your image/file and do a Levels Adj and set the OUTPUT slider to 254.  Flatten and rename if you want.

2-For the GLOP (GL ink position lower right in Curve Creator for the R800) I used Toner for the drop down choice and then went to the Toner TAB and put in "0;80 50;20 100;80""" in the Curve rectangle space which creates an U shaped curve of GLOP.  Your see this when you hit the Show Curve Button.  This puts down 80% GLOP at 0 (highlights), 20% at 50 (midpoint), and 80% at 100 (shadows).  For some reason it is important to put three (""") quotation marks as shown above.

This seemed like a pretty good start to reduce/eliminate the bronzing, but I may need a little more in the 60-70% range on the Epson Ultra Premium Photo Paper Luster.

Any comments or additional ideas appreciated.

Terry