Here's something I posted a while back. It's not directly relevant, but it might provide food for thought.
Using a scanner and a single frame of film I dare say it is possible to scan it differently, twice and combine the results. Though I have to say, with Vuescan's ability to capture the entire dynamic range of the film that the scanner is capable of, and output as a 16-bit file, I'm not sure why combining two images is worth doing. A sequence of standard curves and/or manipulations of Levels should do the trick. The Nikon scanners allow you to manipulate the "analog gain", which in theory allows you to create a 3-frame bracket from one frame of film. Interested to see the results peeps achieve. Jawed -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Jawed Ashraf Sent: 21 November 2001 23:55 To: [EMAIL PROTECTED] Subject: filmscanners: Merging multiple scans in Photoshop to deal with very high-contrast scenes [Digging back in time here...: I know the following isn't really a direct answer to the question, but I just thought I'd bring this technique to your attention] Using this: http://www.digitalsecrets.net/secrets/DynamicRanger.html as the basis for the technique, me and Joel Benford (lurker on this list) set about merging 3 frames into 1 image. We did this on a number of images. He'd used a tripod to make night photographs and carefully bracketed, with the intention of merging later. His HP Photosmart S20+ scanner is no good for this task, as the motorised film feed during scanning causes misregistration of the images. So we ended-up using my Primefilm 1800 scanner (you may think this scanner is crap but it has pixel perfect registration, something I still find quite astonishing!). I no longer have the Primefilm. Tests with the LS40 show it does the job equally well. Instead of using Peter's four control points for the +2EV image, I used two: 255 85 127 70 And instead of using his control points for the -2EV image, I used: 0 172 127 195 The results were very worthwhile. See some samples at: http://www.photo.net/photodb/photo?photo_id=240571 http://www.photo.net/photodb/photo?photo_id=268265 The hardest part is correcting for any rotational error you introduce by scanning. You should experiment with the curves, to suit your taste and, I suppose, the nature of the film used. Of course, Vuescan does this automatically for a single frame, if your scanner supports Vuescans "long exposure pass" option. Jawed > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Rob Geraghty > Sent: 26 September 2001 00:10 > To: [EMAIL PROTECTED] > Subject: filmscanners: RE: filmscanners: Merging multiple scans in > Photoshop to deal with very high-contrast scenes > > > Anthony asked: > >Has anyone here done any significant work with merging multiple scans to > >overcome limitations of film in high-contrast scenes? > > I've tried it with two layers. It tends to show up the limitations of the > scanner very quickly. If you have a scanner with a good range, you may > not have the same issues I did with the LS30. The balance > between the layers > had to be very carefully made, or dark noise and banding ruins the image. > > Rob > > > Rob Geraghty [EMAIL PROTECTED] > http://wordweb.com > > > > ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
