Digital BW, The Print

> Again, the equipment I'm using is an Agfa DuoScan (transparency &
> reflective) which if I remember has a maximum _optical_ resolution of
> 1000x2000 SPI - and then printing to an Epson 3000, 1440x720 DPI.
> 
> I have never understood to my satisfaction what level of scanning
> would be 2x (& I understand lower is ok to about 1.5x) the level of
> the Epson printer.

This formula works to determine the dpi required for offset press. 1.5 or 2
times the line screen = the dpi of the file.  I typically send a 300 DPI
file to offset... this covers a 150 to 200 lpi image setter.

The Epson printers don't require this formula. I use 1440 divided by 3 = the
maximum dpi required for an Epson... but less works well too. I typically
use between 240 and 480 dpi files for my Epson output at the 1440 setting.

Carolyn