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QTR-Quadtone RIP

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Re: Boost K

2016-08-10 by richard@...

I couln't figure out how to embed an image in the post so I put it in the photos section, but that wasn't showing up either... So I just put it into a blog post that explains this in a little more detail.

Basically, the boost is being applied to the entire scale based on what I now assume is a predefined curve built into the .quad generation program.

Here is a screenshot from the post that should illustrate this: The curve I made used a gamma setting applied to each of the 256 steps times the difference between the boost and the ink limit. The QTR generated one is slightly different which is why I think it is using a predefined curve and not some gamma setting.



To answer some of your more specific questions:

Is there a hidden default BOOST K fonction that only apply to the 100% input value, or to the very last values?

- Not unless it is assigned in the K_boost setting_

- How would the BOOST K apply to my 2d layer negative curve: would it boost all the 100% output values or only those "at the end of the slope"?

- I am not sure I fully understand the question, but the boost is dependent on whatever you Gray_Ink_1= is if you had that set to the yellow ink, the K boost would boost that ink only.

- Is it OK to leave the BOOST K blank, or should I make it the same as the K ink limit to get no effect?

- Leaving it blank will not result in some hidden default k boost setting so if you do not want to use it you can just leave it black.

- Is there a way to boost the output for the 100% K input values only?

- Yes, but you need to open the quad curve in a text editor, change the last value for each of the inks to whatever you want it to be and then save it with a different name and then reinstall the quad curves.

- Does the BOOST K fonction work the same way for all printers (I use a 1430 and a 3880)? Yes, it seems to be consistent for all the printers.

Here is a link to the full post with some of the funny math I did to get there...


Hope that helps,
Richard Boutwell

http://www.richardboutwell.com/


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