Digital BW, The Print

Some time ago, someone (Paul R.?) posted a comparison of the dithering schemes available 
for printing in QTR.  I'm unable to find where I put that note.  Can anyone point me to it?

Harry

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "hflockwood" <hflockwood@...> 
wrote:
>
> Some time ago, someone (Paul R.?) posted a comparison of the dithering schemes 
available 
> for printing in QTR. 

http://tech.groups.yahoo.com/group/DigitalBlackandWhiteThePrint/message/89741

I did the tests and it seems it applies only to single jet BO
printing. In 3MK (3 jets firing) I could not notice any visible
difference between ordered and smooth.

Am I right here Clayton?

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "John Vitollo"
<jvlist@...> wrote:
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "hflockwood"
<hflockwood@> 
> wrote:
> >
> > Some time ago, someone (Paul R.?) posted a comparison of the
dithering schemes 
> available 
> > for printing in QTR. 
> 
>
http://tech.groups.yahoo.com/group/DigitalBlackandWhiteThePrint/message/89741
>

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "John Vitollo" <jvlist@...> wrote:
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "hflockwood" <hflockwood@> 
> wrote:
> >
> > Some time ago, someone (Paul R.?) posted a comparison of the dithering schemes 
> available 
> > for printing in QTR. 
> 
> http://tech.groups.yahoo.com/group/DigitalBlackandWhiteThePrint/message/89741
>

Thanks very much; that's the one I was looking for.

Harry

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "the_des_bois"
<thedesbois@...> wrote:
>
> I did the tests and it seems it applies only to single jet BO
> printing. In 3MK (3 jets firing) I could not notice any visible
> difference between ordered and smooth.
> 
> Am I right here Clayton?

I don't know, as I only did the test that one time.  But it sounds
like it from what you say.  All it takes is a few tests with whatever
curves you're using to find which looks best.


Regards,
Clayton


Info on black and white digital printing at    
http://www.cjcom.net/digiprnarts.htm
I-Trak

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "hflockwood" <hflockwood@...> 
wrote:
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "John Vitollo" <jvlist@> wrote:
> >
> > --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "hflockwood" 
<hflockwood@> 
> > wrote:
> > >
> > > Some time ago, someone (Paul R.?) posted a comparison of the dithering schemes 
> > available 
> > > for printing in QTR. 
> > 
> > http://tech.groups.yahoo.com/group/DigitalBlackandWhiteThePrint/message/89741
> >
> 
> Thanks very much; that's the one I was looking for.
> 
> Harry
>

Since the above posting I've run a comparison between Ordered and Hybrid Floyd-
Steinberg (HF-S) dithering (QTR + Piezo K7 + R2400).  There is a subtle but noticeable 
difference.

It appears that edges are more sharply defined using HF-S, with shadows running a bit 
deeper.  It might be necessary to do a very slight Curves correction to bring up the 
shadows.  But it may also depend on the image content as to whether this is required.

The tests I've done so far have been on EEM and HPR, which correlate very well with each 
other.  I'd be interested in hearing from others who may have looked into this.

Harry