Digital BW, The Print

> 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