Another suggestion:
I use QTR on a PC with a P800 printer, which replaced the 3880 and 3800. I use the front feed to avoid “pizza wheel marks” and print my digital negatives on Fixxons for classic cyanotype process.
I make my own curves with the Tools>Curves Creation. Each ink has a drop down choice of: Not Used, Gray Ink, Toner, Toner2, Copy curve from and Load Curve. Click on Load Curve and Curve and a Window or Panel opens with a Tab “Point List” then enter these value for a reverse “S” curve.
0;0 3;19 5;21.5 10;24 15;26 20;28 25;30 30;32 35;3440;36.5 45;39 50;41 55;44 60;46 65;48.5 70;50.575;53 80;56.2 85;59 90;63 95;71 97;81 100;100
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Now when you put a Density Limit in for an Ink and choose Load Curve and put these values in Curve the reverse “S” curve will reduce to the Density Value, say 60 for screen shot example.
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So I use Yellow Ink for my main UV blocker ( actually a UV filter, as the MK or PK inks block UV light) and a little LK ink.
See Attachments:
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How to Linearize: Measure a 21 Step Wedge with a Datacolor Spyder or other device to measure Lab values (maybe Density values work too) and use the QTR linearize feature or the Spyder software has a QTR linearize feature. BWmastery’s Richard Boutwell’s website had and excellent Excellent spreadsheet to Linearize but I don’t see it today.
All 3 of which I have not used since I purchased in 2017 an early version of QCDN for the PC.
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The Yellow ink in the 3880 and 3800 may be a better “blocker/filter” so you may reduce to a 50 density or lower depending on tests.
