Ed: Never did Tri-color in camera myself but it seems that the registration problem may be related to movement of some kind between shots. So.. if it within your capabilities to make a glass insert to place very close to the film plane ( easier in the 4x5 ) that has index marks engraved in the corners similar to ones that NASA used on the Moon landing photography, this might make it possible within Photoshop to both adjust the positioning of the image and to tweak the sizes so that the overlay is better aligned with respect to position and size. The black lines of the indexing marks would have to be spotted out in the Photoshop process but that should be relatively easy. Best of luck on this difficult project. Cheers, James -----Original Message----- From: owner-photoforum@xxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxx] On Behalf Of Ruey Sent: Wednesday, December 16, 2009 7:51 PM To: List for Photo/Imaging Educators - Professionals - Students Subject: New to forum - interested in in-camera tricolor on film I live in Taos, New Mexico where there no longer are "any" photo labs. So I have been experimenting with shooting in-camera tricolor on 120 and 4x5. I can process the film in D-76 and scan it on an iQsmart3 to convert to RGB image in Photoshop. I am using the sharp cutting tricolor filter set - 29 red, 61 green and 47B blue. Registration is an issue. I am going to try oil mounting the three shot RGB 120 strips to see if that helps. I use Tri-X, TMAX and Rollei IR films. I'd be interested in hearing suggestions from others who have shot in-camera tricolor on film. No digital suggestions please. I am only interested in in-camera tricolor with film. (I worked as an R&D engineer on digital imaging systems most of my life and in my retirement, for as long as Kodak et. al. permit, want to keep using film.) Ed Scott
