Digital BW, The Print

Ok one last thought - download the purge file from MIS and print it
Standard.  I still think you might have a nozzle problem.  See if you have
any gaps.


> From: "Nick H. Nugent" <nghin@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Wed, 23 Feb 2005 04:29:56 -0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] QTR and Banding - ALWAYS
> 
> 
> 
> Hi JM,
> 
> I think I understand a little better now. At this point I can only
> speculate as to what may be the source of this banding.
> 
> Each profile supplied with either QTR or IJC/OPM, or Imageprint for
> that matter, are designed from a particular printer and media, and
> ink. As we know all Epsons of a particular model are not the same.
> What I'm leading to is the ink limits and densities may vary from
> printer to printer. This may lead to a rare but very possible scenario
> in which you get an extremely narrow overlap between the light and
> medium gray inks.
> 
> One ink starts to fade out before the other gains in strength causing
> a lack of a smooth transition in tones. I can easily see that the
> transition from medium to light gray is the most vulnerable to
> variation in printhead characteristic. So I think it just so happens
> that the canned profile that came with QTR doesn't work properly in
> your situation. Again I'm assuming that missing or deflecting nozzles
> are not involved.
> 
> I think it is a good idea to create a profile for the paper/inkset
> that you are having problems with. You can quickly create one within
> just half an hour just to prove whether the problem is with QTR or not.
> 
> --nick
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "joemulligan_68"
> <joemulligan_68@y...> wrote:
>> 
>> Hi Nick,
>> 
>> Thank you for your feedback.  I simply use the curves that are
>> loaded with the Windows version of QTR/QTRgui.  Yesterday, I printed
>> some images of rock formations with sky and clouds above.  What I
>> notice is that the highlights show some sort of "dither banding"
>> while with the shadows (rocks) this banding or dithering is
>> camouflaged.  It is highly obvious in high key images.  This banding
>> always runs parallel to the print head.  I have ruled out paper
>> alignment and nozzle problems because this problem only happens with
>> QTR.  It sometimes happens on some images with Imageprint but I have
>> never seen it printing the same files with IJC/OPM nor the standard
>> Epson driver.   
>> 
>> I just want to know if anyone has the same problem.  I can try and
>> relinearize as you suggest but this problem happens with every curve
>> that is loaded with QTR.
>> 
>> Any other thoughts?
>> 
>> JM