I work at restoring a particular set of old photographs (see here – http://www.flickr.com/photos/theonema.... The first step in restoration is to put each of the three images on a separate layer, and then use Auto Align Layers to line them up. But in many cases, the emulsion on the photos has shrunk, and they don't line up properly. What I would like to see is a tweak to the Auto Align Layers command, such that I can (1) specify which layer is the one the others align too, and (2) improved coding such that the layers will transform so as to more precisely line up. An algorithm for doing this work was developed by Blaise Agüera y Arcas, which he discusses here – http://www.loc.gov/pictures/collectio.... It would be extremely useful to me, and to the community of restorers (a small group, but a dedicated one) if Align Layers could have a set of subcommands to achieve these objectives. I believe that very little actually needs to be done to the existing algorithm in order to do so, because Auto Align layers (if you check off the vignette and lens distortion boxes) does a pretty fair job of aligning most of the plates.
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