Apache-Talk @lexa.ru 

Inet-Admins @info.east.ru 

Filmscanners @halftone.co.uk 

Security-alerts @yandex-team.ru 

nginx-ru @sysoev.ru 

   


   


   















      :: Filmscanners
Filmscanners mailing list archive (filmscanners@halftone.co.uk)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: filmscanners: 35mm filmscanner choice



>A comparison of the LS4000 and some Imacon, a while back, seemed to indicate
>that the LS4000 has resolution roughly equal to the Imacon's 3200dpi (some
>parts of a test image were better, others worse).
>
>Does anyone have a thorough understanding of this?  Have I got the wrong end
>of the stick?
>
>Can someone explain how to go from ppi to lpi?
>
>Jawed

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>.

Mike Duncan





 




Copyright © Lexa Software, 1996-2009.