I'm trying to assemble a specific vertical panorama, but also trying to learn methods for assembling a vertical panorama.
One major issue (that I'm furthest from figuring out on my own) is the exposure issue: Taken on a cell phone (fixed F 1.9, Focal length 2.91, aperture 1.85, not sure those even have the same meaning as on big camera) with auto varying time: Bottom photo is 0.025 sec exposing the street well and including some totally blown out sky. Middle photo is 0.0083 sec exposing buildings well with sky blown out and street too dark. Top photo is 0.0073 sec exposing the sky well. I definitely don't want to compress the range. I'd rather be dishonest than correct for that. If the alignment were perfect, then doing no exposure correction would work with the blending from one image to the next smoothing the exposure transition. But I haven't gotten the alignment near that good and would like to learn how to live with poor alignment. That involves narrower transition zones in controlled places, which would then generate ugly exposure jumps. What I think I want is a height based exposure shift in each photo (rather than the usual exposure to exposure nonlinear mapping to compress the range without losing much detail). In each photo I think I want a smooth transition from making the bottom a little brighter to making the top a little darker. Then the same final pitch of each photo would match in brightness. I think this height based exposure issue may be a common problem, not just something in this set of three. 1) Have I misunderstood the issue and there is a very different basic solution? 2) Or is there a way already in hugin to adjust exposure the way I described? 3) If I need to use an external tool, how should I measure the amount I want to adjust exposure and/or compute it from the exposure times reported in EXIF? 4) What open source tool is easiest to use to pre-apply an exposure shift based on vertical position. Also, is there good info on the other techniques for a narrow vertical panorama? I don't know what projection works OK. The best I found with a google search is to turn the whole thing sideways and use the usual methods for that kind of panorama, then rotate it afterward. Is that really the best way to do narrow vertical? I can put the photos and project etc. on my google drive and provide a link, if that would really help. But I would prefer generic advice that fit this category of problem rather than specific help for this set of 3 images. -- A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ --- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/62552292-82b5-4b0e-b924-11d155131a03n%40googlegroups.com.
