Digital BW, The Print

--- 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