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...
Message
Re: [QuadtoneRIP] Re: Boost K
2016-08-10 by Roy Harrington
Thanks, Richard. Nice demo and graphing of the boost effect.
Also very good demonstration of testing and figuring out what a feature does.
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For the math inclined it's simply a gamma-like function chosen so that the
left end slope matches the slope of LIMIT_K line and the right end-point matches
the BOOST_K value. It affects the whole range but mostly on the right end.
(formulas are good but seeing it is much more informative :)
Roy
On Wed, Aug 10, 2016 at 10:05 AM, richard@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote: