Digital BW, The Print

Austin,

As Mike says I believe the Epson's are printing at 720 dpi in the 
direction of head travel and the 1440, 2160, 2880 and 5760(?) would 
be in the direction of paper travel as a function of the paper 
advance increments. With the 1280 I noticed neglible improvement in 
print quality (with Epson driver) at 2880 over 1440 at a horrible 
decrease in print speed.

The "Good", "Better" and "Best" settings in the latest Piezo driver 
seem to be linked to these transport increments which probably vary 
from model to model. I think most of the Piezo claims are based 
around the 3000 but I am not sure.

Martin Wesley

--- In DigitalBlackandWhiteThePrint@y..., "Austin Franklin" 
<darkroom@i...> wrote:
> 
> > Austin,
> >
> > Epson printers print at 720dpi. They then offer the 1440dpi mode
> > which tells the head to make 2 passes per line, and 2880dpi mode
> > which instructs the head to make 4 passes per line.
> 
> Hi Mike,
> 
> I really don't believe the number of passes has anything to do with
> resolution of the printer.  It MAY make N passes, but I think that 
is
> subsequent to the resolution...
> 
> > So in reality, I guess what they are really saying is that the 
Piezo
> > dpi is really a 3 pass dither.
> 
> No, like I said above, the number of passes really has nothing to 
do with
> the resolution of the printer, though the printer may implement/use 
N passes
> because of some other reason...but the printer resolution is simply 
at what
> increment can the print head/paper can advance...in additional to 
the print
> nozzle spacing.  Those are all fixed, no matter how many passes the 
print
> head may make.
> 
> > The new copy of ImagePrint 4 that I got recently offers 8 pass
> > printing. To watch the printer is really interesting. The head 
goes
> > backa nd forth 8 times before the paper advances.
> 
> Does that give it 8x the resolution ;-)
> 
> Regards,
> 
> Austin