On Sun, 29 Jul 2001 19:38:14 -0400 Mike Duncan (mgduncan@esper.com) wrote:
> ppi is sampling rate. Under ideal conditions, the maximum lpi is half
> the
> ppi. In practice, lpi is 1/3 to 1/4 dpi or even less if the optics or
> focus are poor. For a theoretical discussion see
> <http://www.normankoren.com/Tutorials/MTF2.html>.
..or indeed the section about resolution at my site :)
Regards
Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner info
& comparisons