---------Included Message---------- >Date: 9-Jun-2007 01:06:25 -0400 >From: <[EMAIL PROTECTED]> >Reply-To: <[email protected]> >To: <[EMAIL PROTECTED]> >Subject: [filmscanners] Re: film and scanning vs digital photography > (I think the >objective consensus would settle on a 10mp equivalence with 35mm film at >100 ISO, and 8 mp at 400 ISO). > In my case, I got >still further improvement in image information and detail moving from >4000 dpi to 5400 dpi (and these weren't even drum scans) From what I >saw in my scans and from DSLR's, it was not until you got to 10 mp that >image quality was really comparable (note, that I usually am shooting at >ISO 100).
A few weeks ago I tried an experiment. I took an image that I took in full sunlight with Provia 100 film with a Nikon N90s camera and 70-300 mm Nikon zoom (of the World War II Memorial in Washington DC). I scanned it at 4000 dpi with my Polaroid SprintScan 4000 scanner, giving a 5,375 x 3,546 pixel image. When I enlarge the image I do see some irregularities which might be film grain, but I can't tell for sure because I don't know what film grain looks like. I then used bicubic resampling to reduce the image to the size of a Nikon D200 image ie. 3,872 x 2,592 pixels (10.2 megapixels- the equivalent of scanning at 2881 dpi). I put the two images side by side on my dual monitors and zoomed down to a fine image detail (a person standing near the monument). Although the pixels were clearly larger in the latter image, it didn't seem to me that any image detail was missing. This would seem to be consistent with the "objective consensus" claim that 35 mm film at ISO 100 is equivalent to 10 mp, but it would also suggest that there is no benefit to scanning film at resolutions higher than about 3000 dpi. This conflicts with claims that it is beneficial to scan at 4000 dpi or higher resolutions. Am I likely seeing the limitations of the optics of my scanner rather than of the information capacity of the film? Anybody know how well the optics of the Polaroid SprintScan 4000 compares with those of Konica-Minolta or Nikon scanners? ___________________________________________________ Dr. Paul Patton Life Sciences Building Rm 538A work: (419)-372-3858 home: (419)-352-5523 Biology Department Bowling Green State University Bowling Green, Ohio 43403 "The most beautiful thing we can experience is the mysterious. It is the source of all true art and science." -Albert Einstein ___________________________________________________ ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
