Federico,
Regarding your Epson 1500W setup, you asked:
>... Now I am stuck at QTR profiling...
>
I am using Ilford Gold Fibre Silk and I would like to build a carbon profile.I assumed you used the mixing and arragnement of the "Glossy Carbon Variable Tone" inkset I described at
I link in the PDF to my profiles at
I see you found the link and profiles.
You might also want to look at the RR(Red River) SGFibber-serial-carbon as well as the HPR-Baryta-carbon profile you mentioned.
Did you just try re-linearizing one of them.
>With the first ink ink separation print (ink limit = 100%) PK does not visually increase above 45%.
You'll see in the profiles I mentioned above that I set the default ink limits to 40 or 45. (I was able to get a little bit more with the boost -- to 52 or 53 -- based on spectro reads.)
>I decided to use ink limit = 35% + black boost = 45%.
That's close.
>I printed 21step.tif (in the QuadToneRip directory) with the newly created profile.
>To my naked eye, I see some problems:
>
1. the light patches are quite light>
2. the gradient on top shows some tiny bandingYou can see the pre-linearization values for my profiles in the Linearization tab of the Curve Creator if you're using Windows. You can graph that also. They are light. Yours will be lighter because of your ink limit settings. You can usually increase those somewhat.
The 1400-1500W line is famous for some microbanding in the top and bottom (about) 1 inch (closer to 3 cm) of the image. Both transport rollers need to be engaged for the best paper transport and printing smoothness.
If the problems of banding are in more than the top and bottom areas, you might find the Epson driver smoother. I believe it uses a different way for dealing with those parts. That inkset is Epson driver compatible. I suspect I have a carbon or warm PS image adjustment curve for that approach.
Good luck with the inkset and profiling.
Paul
On Mon, Apr 3, 2017 at 3:03 PM, f.cozzi@gmail.com [DigitalBlackandWhiteThePrint] <DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:
Hi Paul,
I managed to mix inks and fill carts!Now I am stuck at QTR profiling...I am using Ilford Gold Fibre Silk and I would like to build a carbon profile.With the first ink ink separation print (ink limit = 100%) PK does not visually increase above 45%.(perhaps a densitometer could find a tiny difference between 45 and 50...)Increase from 35 to 40, and from 40 to 45, is small. So I decided to use ink limit = 35% + black boost = 45%.To me, this looks similar to your HPR-Baryta-Carbon which uses ink_limit=45 + boost_k=53In the second print I found the following relative densities with the help of the scanner of a multi-purpose printer:C = 53%M = 36%LC = 18.5%LM = 11.50%which again is quite similar to your HPR-Baryta-Carbon.Finally I printed 21step.tif (in the QuadToneRip directory) with the newly created profile. To my naked eye, I see some problems:1. the light patches are quite light2. the gradient on top shows some tiny bandingI think I can solve point 2 by increasing the gray overlap, as discussed here: http://www.bwmastery.com/blog/2015/in-search-of-the-perfect-qtr-profileWith gray_overlap = 75, gamma = 1.7 the gradient has no banding and looks smoother (more inks firing at the same time?)However this makes light patches even lighter and the scanner is not able to distinguish them.If I keep gray_overlap = 75 and revert to gamma 1, light patches do not get much lighter; patch 95 becomes similar to patch 100.I am thinking that, if I could "pre-linearize" by eye, the real linearization with my scanner could become easier.Thanks,Federico