QTR-Quadtone RIP

Well, I haven't gotten any replies on this so I'll just let you know what  
I did. I loaded the .quad file data into Excel, plotted the curves, and  
then plotted the resultant overall curve based on my ink density factors.  
Then I modified the LK  and K curves to reduce the LK and have it go to 0  
sooner and increased the K ink to compensate. Then I modified the .quad  
file with my new values and ran another 21step test strip print. After a  
couple of iterations, I got it looking quite nice. I was kind of flying in  
the dark but it wasn't as hard to do as I thought it might be.
Steve


On Wed, 16 Apr 2008 14:35:48 -0700, Steve and Ann Taylor  
<taylorfamily3688@...> wrote:

> I have made several curves for other papers and this paper is giving me a
> problem that has not occurred before. I am running an Epson 2200 with K7
> inks. I printed the ink pattern page from the calibration mode with the
> ink calibration slider set to 100 (all the way to the right.) I looked at
> the steps and determined that I was getting the max black at about 45 and
> that above that there was no increase in black level. There was, however,
> no decrease either. I reprinted the page with the ink level setting at 45
> and then used that to determine the densities for the 7 channels and then
> printed the 21step.tif file. The last two steps at 95 and 100 are lighter
> than the 90 step and they are lighter than what the blackest ink was
> laying down in the ink pattern page. When printing the ink pattern, it
> would stay completely black beyond 45 all the way up to 100, so I don't
> think the 95 and 100 steps of the 21 step strip are lighter due to over
> inking of the blackest ink. When I look at the curves, I see that the  
> next to darkest channel, Lt Black, has an overlap with the darkest black  
> all
> the way up to 100. Actually, at a binary value of 255 it is at 0 but at
> 254 an under, there is some Lt. Black being layed down along with the
> Black. I believe that is what is causeing my last two steps to be lighter
> than what they should be. How do I control the overlap? Any value entered
> in the overlap setting inceases the overlap. I need to decrease it. I  
> have tried all kinds of variations, and I can't figure out a way to  
> reduce the
> Lt. Black overlap with Black. I could go into the .quad file and edit the
> values directly, but there must be a more elegant solution that I am not
> seeing. Can anyone tell me what I am doing wrong and how to get the  
> deeper blacks that I see on the ink patter page printouts.
>
> Thanks,
> Steve
>
>



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