QTR-Quadtone RIP

Dear Paul,

thank you for your answer. I still have some questions:


On Jun 5, 2012, at 17:54 , Paul Roark wrote:


> 
> See http://www.paulroark.com/BW-Info/UT-3D_Readme.pdf for a description of
> the inkset. Profiles are available for downloading. Although I don't have
> one for Ilford Galerie Gold Silk, take a look at the curves for similar
> papers. Starting with one of those curves would make sense.
> 

Thanks. I had already read this, but I reread it again to make sure I had not missed anything.




> >
> > I now would like to profile the the Ilford Galerie Gold Silk (a baryta
> > paper, which I rather like), but when doing so I get LAB values which are
> > inverted at the black end (See results as the bottom)....
> >
> I suspect you are not turning off the Eboni. The driver injects Eboni MK
> as the 3 color curves approach the black point. You stop that by having
> one of the inks head back down, ultimately to 0 at the 100% black input
> point. See the curves I've made for the inkset and glossy papers. (Let me
> know if there is a problem with the pre-zip file method I used for
> downloading.)
> 
> If you are turning the Eboni off, then the other options are that the ink
> load may be too high for that paper. Which paper type is specified in the
> driver alters the ink limit, and you can also lower the black ink load by
> having the Green curve (Magenta ink control) stop at 90%. That is, when
> the input is 100%, have the Green curve only at 90%. Be sure the blue
> (and/or red) curve(s) are totaly "off" by that point. You don't want the
> driver to put any Eboni MK into the mix.
> 
> 
How do I do this? I am using a Mac (10.7) with Photoshop CS5. When printing the grey scale wedge, I set the Photoshop print dialog to printer manages colour and then disable colour management in the printer driver printing dialog. When I do this I do not have any access to the sliders to control the amount of ink. So I cannot turn off the Eboni Ink. I assume I am missing something fundamental here.


Some more observations, I just realized  that the black 100% square still smudges even after having dried for more than 24 hours. I have now replaced the MK ink cartridge with the PK cartridge and have printed a new strip. It is difficult to tell by eye if there is any improvement, although I have the impression that it looks slightly better. I will let the print dry for 24 hours and make a measurement tomorrow.


Thanks,

Andrew


 



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