Digital BW, The Print

Go long, it's a big sheet and we need a touchdown of Dmax!

:-)

All this talk about how many times the head passes comparative 
to 'resolution' makes sense in the multiples...it's true in the 
scanning too, in that if you use the long axis on the longer axis 
resolution you get 'more' data - or so it's been written.

A curious thought...in my Epson 3000 user guide page C-1 "Line 
Spacing" is 1/6" default, programmable in 1/8" and 1/360" increments.

Since the 3000 was the 'first greatest home printer' ;-) it wouldn't 
surprise me if the next generations had this programmable feature as 
well.

Paper feed is 100 milliseconds per 1/3" line...not that it means 
something to me yet.

Cleavis in AZ

Hi Cleavis,

> All this talk about how many times the head passes comparative
> to 'resolution' makes sense in the multiples...it's true in the
> scanning too, in that if you use the long axis on the longer axis
> resolution you get 'more' data - or so it's been written.

It isn't true with scanning (or printing).  Multiple passes with scanning
simply decreases the noise because the errant samples are thrown out, and
the others averaged...  That has nothing to do with increasing resolution.

> A curious thought...in my Epson 3000 user guide page C-1 "Line
> Spacing" is 1/6" default, programmable in 1/8" and 1/360" increments.

As an FYI, the printheads on the 3000 are organized as follows:

black - 4 staggered columns of 32 nozzles each (128 total)
color - 2 staggered columns of 32 nozzles each (64 total)

The horizontal spacing of the nozzle columns is 32/360 inch...  One thing to
note, is the black nozzles are twice as vertically dense as the color
nozzles.  The column height is ~.35"... which makes the vertical nozzle
spacing 1/180 for the color nozzles, and 1/360 for the black nozzles.

Now, back to print resolution...720DPI is only available in raster graphics
mode.  The following command sequence will give you 720 raster graphics
mode:

char *PrintRasterGraphics720 = "\x1b\x2e\x01\x05\x05\x01\xd0\x02\xa7\xff";//
ESC .

This is an "ESC . 1" command...as documented in the "Epson Programming Guide
For Three and Four Color Epson Stylus COLOR Ink Jet Printers (Level
I)"...and the 0x05\0x05 sets the printer to 720 x 720 mode...see page 22.

Regards,

Austin