QTR-Quadtone RIP

The problem with using PKHD ink with a traditional K7 set is the Shade 2 through 7 are very not glossy and PKHD is made with the new carbon that we make pro ink out of so it’s super glossy.

So it gets really tricky to perfectly optimize gloss diff (specifically for GO printed photos) with this new inkset when you want the L*.9 to L*1.6 range dMax of PKHD+GO. The PKHD gets very glossy but you can’t shift to under-print in a traditional overlap sense because this does not make nice on a lot of papers in the first 10 (of 256) shadow patches. (the PK will actually get less glossy with GO and shade 2+PK will get more, and then less, and so-forth).

Here’s an example of an optimized curve for the new PKHD ink that evens the gloss throughout the tonal range so that it can be gloss optimized properly. https://piezography.com/hdpk.png <https://piezography.com/hdpk.png> (this is for carbon k7 in with HDPK on gloss baryta surface papers).

Notice how magenta (shade 4) and cyan (shade 2) actually reverse their TIL in the middle of their peaks and shade 2 (cyan) actually mostly just underprints the HDPK. This required some weird twists to get right . . . and I’m still optimizing for some papers by making one curve with one particular post-go gloss differential and another curve with the opposite post-go gloss differential and then blending the two.

Best,
Walker




> On Sep 12, 2017, at 5:43 PM, richard@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> The traditional QTR curves can be smoothed with the smoothing tool to greatly increase the overlap from one ink to the other to minimize the appearance of the ink transitions. Then you can apply the print shield or hah protective spray as needed. One benefit of using the spray is you can go over the areas where it is needed more as you see fit. 
> 
> 
> Hope that helps, 
> Richard Boutwell
> 
> http://www.richardboutwell.com/ <http://www.richardboutwell.com/>
> http://www.bwmastery.com/ <http://www.bwmastery.com/>
> 
> 
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