QTR-Quadtone RIP

Dana and I coming up with a tutorial and video on how to properly use Roy’s QTR linearizer for Piezography. In recent testing, to get the same linear character of the Piezo quads with Roy’s linearizer, it does require a slightly different target that has been encoded with a specific gamma so stay tuned.

I have beta (!!! very beta) targets and workflows (colorport/i1Profiler) here: https://drive.google.com/open?id=0B4gHbc7Tg9-SOWhsS01BVFJmUGs <https://drive.google.com/open?id=0B4gHbc7Tg9-SOWhsS01BVFJmUGs>

1. There is no documentation yet so please wait for that if you aren’t familiar with using ColorPort or i1Profiler targets and workflows.
2. These target files are for Piezography. They won’t exactly work for everyone else using QTR.
3. These target files are not the averaging targets (aka, 21x4) yet. 
4. We’ve had some trouble getting a cgats output to be properly read by the linearizer. I’ve included a sample cgats file that works in the folder above. The L*a*b* values can be swapped out with the measured lab values from your print as long as you properly trim the row count and make sure END_DATA is after the last measurement number.

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5. Making master curves for Piezography is a whole other ballgame. Piezography requires very finely tuned under-printing that is variable and specific to each ink shade and printer type and media. It’s literally a dark art. I have been working on a set of master curves that are kind’of a new take on curve building, but that is all I can say at this point because they are so early in their development stage. Dana is also hard-at-work on a set of master curves that enable dual K4 and GO printing. Again, this is a multi-year long effort to make sets of piezography master curves. It requires thousands of prints and is very manual.

cheers all,
Walker



> On Apr 7, 2016, at 9:29 AM, artodd138@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> Hi Everyone,
> 
> 
> I've just begun working with QTR and I'm having a bit of trouble creating my own custom curves.  I've been working through the documentation that comes with QTR, however I fear that some of the tutorials are slightly dated.  I was hoping someone on here could direct me to more recent tutorials on the process.  Below I've outlined my setup and where I hit roadblocks.
> 
> I'm working on a Mac 10.11.3, Photoshop CC 2015, QTR v2.7.7, X-rite i1 Pro and i1 Profiler, an Epson 7800, and Piezography Special Edition P2 inkset.  I'm able to install QTR and print with Jon Cone's P2 curves just fine.  I want to try creating custom QTR curves for papers without Piezo curves available.  Through the tutorials provided with QTR I am able to print the calibration sheet, determine default ink limits and crossover values for the 6 shades.  Where I run into trouble is placing these values into the text file and then creating the curve.  Supplied with QTR there are no ink descriptor files that are close to the set up I am using and I've tried to use something relatively close, but I am still unclear as to how to properly edit the file for this workflow.  I'm also confused as to how to then create the curve from this file.  I have not had luck dropping it onto the Drop-Quad-Profile droplet.  If I simply place the text file into the appropriate folder and run the install command it will create the curve and I am able to use it, but I'm not sure this is the preferred method.  
> 
> Any insight would be really helpful.
> 
> Thanks very much.
> Andy
> 
> 
> 
>