QTR-Quadtone RIP

I'm sure Roy monitors this list and I imagine, if he had anything to add,  
he would do so. I think what we are seeing is just inherent in the curve  
creation methods used in the program. I am very grateful that we have this  
program and also that Jon Cone supports it with his profiles. I am  
resigned to the fact that when stepping outside the supplied profiles, I  
am pretty much on my own. I was just hoping someone else would have  
already been down this path and would have developed some alternate  
methods to creating better custom curves.

Steve T.

On Tue, 17 Mar 2009 20:07:31 -0700, dpgoldenberg33  
<dpgoldenberg33@...> wrote:

> Steve and Steve,
>    I have been happily  making curves for my Epson PS1400 and the MIS  
> UT-14 inkset.  Some of my curves definitely are "bumpy", but the output  
> seemed OK.  But, after reading your posts, I downloaded the test file  
> from Northlight and saw distinct rings in the radial patterns when I  
> printed them.  As you describe, the discontinuities in the output  
> correspond to the places that the curves look bumpy.  I played around a  
> bit with smoothing the curves, and was able to improve the output  
> significantly.
>
> This seems to me to be a weakness in the QTR curve-generating programs,  
> especially when the "linearization" routine.   My suspicion is that the  
> problems are worst when the curves have to be modified extensively to  
> linearize them.  It might be that the problem can be minimized by better  
> optimizing the original curve, through judicious choice of parameters,  
> so that the linearization routine doesn't have to distort the curves so  
> much.
>
>
> Has anyone asked Roy Harrington about this problem?
>
>
> David
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>



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