QTR-Quadtone RIP

Dear  Steve,

I just ran into QTR;- I have a 4800 pro epson printer branched on a mac pro
intel computer. So far I was not able to print nice BW prints on Hahnemule
rag brite papers. They look gray or are to dark. Detail is missing. On
glossy paper everything i fine in the black prints.

This weekend I started to use QTR. BW prints look a lot better though in the
deep shadow parts the blacks are far to saturated and look ugly greenisch.

I do not understand the system of calibrating. I am a gratuated enigeneer
and used to math. But the way things are explained is not lolgical for me.

I am curius wat steps you take to calibrate. Why are there no sliders to
ajust all the ink separately.

After calibration mesurement how can I tell the printer what to do.

Greetings Walther Walraven


Op 21-04-2008 19:57, Steve and Ann Taylor <taylorfamily3688@...>
schreef:

> 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
>> 
>> 
> 
>