Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Clayton Jones"
<cj@c...> wrote:
> Hello Ernst,
> 
> >I'm still convinced that much of those BO banding issues can be 
> >diminshed to zero if the black ink can be squirted from many 
> >nozzles. 
> 
> I can't argue with the idea, not having tried it, but I wonder...

Clayton and Ernst, I don't know how helpful this will be but...
I have to first say I haven't used QTR for many months, an old beta
version. But I noticed with it, and with SudioPrint with certain
dither/quality settings, that a ramp of individual inks could show a
linear dither pattern at specific percentages, and it would move from
random (aprox) through the linear pattern, and back to random as tones
gradated through that tonal zone.
Things may have changed, but Roy and I discussed it briefly back then.
This rarely shows up in images with photographic detail, and/or with
multiple inks present dithering together at different percentages.
But, with something like BO, or even a heavily partitioned quad
workflow, this could easily be revealed, particularly in smooth tonal
areas of the right value.
I have no solution, nor am sure it's related to your discussion. My
suspicion is that it is driver specific, has to do with dither. Roy
would certainly know more, I believe many complex things are happening
with the dithering of an individual channel, not only is dot spacing
changing with value, but dot size is as well, along with other issues
like stochastic, diffusion, etc.. How perfectly a driver accomplishes
all that may be relevant.
Tyler