Archived posting to the Leica Users Group, 2001/07/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Noise doesn't necessarily limit resolution or dynamic range--it just adds noise. - ----- Original Message ----- From: "Austin Franklin" <darkroom@ix.netcom.com> To: <leica-users@mejac.palo-alto.ca.us> Sent: Tuesday, July 24, 2001 16:16 Subject: RE: [Leica] Scanning > > > The recent POP Photo scanner review *measured* the resolution of > > the LS-4000 at 60 lp/mm. As I understand it, noise plays a major > > role in reducing the true resolution of a scanner down from the > > theoretical resolution (which would be 78 lp/mm for a 4000 SPI > > sensor). > > I'd have to think about that, but that does not make sense (noise limiting > the resolution) to me. Noise certainly does limit the dynamic range (which > is on a per pixel basis), but I fail to see how it limits the resolution, > which would be across pixels. If the lense is not up to snuff, or the > scanner has vibration issues, I can see that limiting resolution...but not > noise. >