Digital BW, The Print

I am asking this question to all the people using 3MK with QTR,
expecially with the 3.5pl Epson printers (like Robert Brake). 

Here is the question.
Did you ever compared DMAX obtained from 3MK with that obtained with
one black cartridge only (using the same ink, of course)?
The rational behind the question is as follow. When you use an ink
limit lower or equal to 50 with QTR and more than one ink channel
(like you do with 3MK) the head uses the smallest 3.5 pl droplets and
it deploys those droplets in many more dots, because of the dithering
with thre channels combined. On the other side, when using one channel
only, the 100% black is obtained using the largest droplets the
printing head is capable of, with the ink being deployed on 1/3 of the
points. Therefore, at least in theory, 3MK might be able to induce a
larger inkload on the paper and, potentially, a better DMax.
Do you 3MK users experience such effect?

Thanks. 

  Daniela

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "dgattarino" <dgattarino@...> 
wrote:
>
> I am asking this question to all the people using 3MK with QTR,
> expecially with the 3.5pl Epson printers (like Robert Brake). 
> 
> Here is the question.
> Did you ever compared DMAX obtained from 3MK with that obtained with
> one black cartridge only (using the same ink, of course)?
> The rational behind the question is as follow. When you use an ink
> limit lower or equal to 50 with QTR and more than one ink channel
> (like you do with 3MK) the head uses the smallest 3.5 pl droplets and
> it deploys those droplets in many more dots, because of the dithering
> with thre channels combined. On the other side, when using one channel
> only, the 100% black is obtained using the largest droplets the
> printing head is capable of, with the ink being deployed on 1/3 of the
> points. Therefore, at least in theory, 3MK might be able to induce a
> larger inkload on the paper and, potentially, a better DMax.
> Do you 3MK users experience such effect?
> 

Hello Daniela, 

Back when I tried BO printing with a 220 I didn't have a spectro.  The dMax results I got 
with 3 and 4 mk on a 220  with PAHP205 were I believe close to what I get from the UT-
3D I normally use in the 220: in the neighborhood of 1.60.  I'm away from home for a 
while so can't check it.

Have you found any more info on how or if QTR takes advantage of the variable droplet 
size in the newer printers.  For me it was just a theory but it might provide some great 
advantages in different inksets.  Might be a question to ask in the QTR forum.

Hello Robert,

  no other findings other than what I mentioned. Since we print only
on uncoated paper, we run all the inks with an ink limit of 50 (except
for 100% black) in order to spray the inks at the smallest available
size. Then, we optimize the dilutions of the lighter grays for a
particular paper.

Daniela



--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "robert49brake"
<robert49brake@...> wrote:
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "dgattarino"
<dgattarino@> 
> wrote:
> >
> > I am asking this question to all the people using 3MK with QTR,
> > expecially with the 3.5pl Epson printers (like Robert Brake). 
> > 
> > Here is the question.
> > Did you ever compared DMAX obtained from 3MK with that obtained with
> > one black cartridge only (using the same ink, of course)?
> > The rational behind the question is as follow. When you use an ink
> > limit lower or equal to 50 with QTR and more than one ink channel
> > (like you do with 3MK) the head uses the smallest 3.5 pl droplets and
> > it deploys those droplets in many more dots, because of the dithering
> > with thre channels combined. On the other side, when using one channel
> > only, the 100% black is obtained using the largest droplets the
> > printing head is capable of, with the ink being deployed on 1/3 of the
> > points. Therefore, at least in theory, 3MK might be able to induce a
> > larger inkload on the paper and, potentially, a better DMax.
> > Do you 3MK users experience such effect?
> > 
> 
> Hello Daniela, 
> 
> Back when I tried BO printing with a 220 I didn't have a spectro. 
The dMax results I got 
> with 3 and 4 mk on a 220  with PAHP205 were I believe close to what
I get from the UT-
> 3D I normally use in the 220: in the neighborhood of 1.60.  I'm away
from home for a 
> while so can't check it.
> 
> Have you found any more info on how or if QTR takes advantage of the
variable droplet 
> size in the newer printers.  For me it was just a theory but it
might provide some great 
> advantages in different inksets.  Might be a question to ask in the
QTR forum.
>