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P900 and P908 Questions

 

Hello All,
I am hoping to get some guidance on using P900 and P908 on Windows 11 using QTR GUI.
  • Using P900, I have been able to successfully create MK profiles using K, LK, LLK, M and LM?and K only (BO).
  • What is weird is that I used P900 (not P908) to accomplish this, using "matte ink" in drop down menu. This seems contradictory to release notes 2.8.2. I am getting densities in 1.5 to 1.65 on matte papers, so I am confident MK ink is being used.
  • I used the customary curves creation dialog in GUI to define inks, densities, and limits, followed by linearization. I am getting good results.
  • Ideally, I would like to utilize V ink in the deep shadows (70 - 100%) to create an "eggplant" hue in these areas. The hue will not be visually evident in the last 90 to 100%.
  • I understand V ink is not supported for Windows. But according to 2.8.2 Release Notes, I can create full 10 ink curves on a Mac. Can I use these curves on Win GUI? And they would utilize V ink?
  • I am not familiar (at all) using Mac, but I was able to get a retired MacBook Pro (2011 edition) from my niece which has El Capitan (10.11) OS. I figured out how to create and linearize curves in Mac OS (in my mind, not actually done yet). I was able to print the 10 ink calibration page just fine.
So, can this be done? Create curves/profiles on a clunker Mac, but install them in Win 11 and be able to utilize V? Thank you all.
 

Hi Shilesh

I'm not really convinced you are getting MK but you'll see soon enough.
Anyway the main thing is yes you can use the Mac and use all 10 inks.
Create the .quad files and move them over to Windows.
Make sure you are using 2.8.2 -- look at About and the version of quadtoprinter
Printing will work fine with the 10-ink .quad files. Don't try Curve Create or
the Show Curves with QTRgui. They will both crash.

Roy
 

Thank you, Roy,
You are likely right about MK. I remember copying some .qidf files from P908 to P900 folders, and may have forgotten how I sent the 51 step files to which printer in Win GUI. I will check when I get home.
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And ... it is great to know that I can create the .quad files on a Mac and copy them onto the Win folders and get control over full set of 10 inks. I used to something like this on an old 4000, where I had switched out one ink to 3d party violet ink. I probably have .qidf and .quad files still on my computer, along with Lab values that will guide me on choosing the right limits and densities for the 70-100% patches for the eggplant look. I believe I just copy K to drive the V, with small (2 or so) ink limits.
 

Roy's right, I was using P908 to print, not P900.?
 

Hi Roy,
This worked perfectly. I have only made experimental .qidf (text) and .quad on Mac for a quick grasp of methods, then saved .quad file in P900 folder on Win machine. Printing through Win GUI Quad900 printer showed the curve, and printed with my expected hue (exaggerated for experiement). Top pictur is unmodified (no V) and bottom is modefies (+V). Now for the hard part of creating actual curves, and setting up split-tone curves ... thank you for your help.
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