On 23 Dez., 03:42, Calvin McDonald <[email protected]> wrote: > Thanks for the help Kay. > > After 5-6 failed attempts trying to exposure-fuse within Hugin, I'm now > trying image-set by image-set with command-line enfuse. > > I'm getting pretty good (acceptable) exposure-fusing results via > command-line, so I'm encouraged. However, I'm on to the next problem.... > alignment. I know better now but when I took the image-set I made the > mistake of not taking the two exposure shots back-to-back. I took the 12 > upper row shots at exposure setting #1, then went back and took the 12 with > the alternate exposure. Although tripod mounted with a nice detent pano > head, it of course didn't create perfect alignment between the image > pairs. The alignment error is about 20 or so pixels - just enough to make > the transition from land to sky look horrid. > > How do I align them?
You should be able to do it all in hugin. When you say your attempts failed, what went wrong? There is one common mistake in your situation. I suppose you still have your initial attempt with all the images in hugin. Since your stacks are not perfectly aligned the way you took them, you have to uncheck the 'link' checkbox next to the image position fields in the images tab for each of your misaligned stacks. If you don't do that, the stacked images will be placed precisely on top of each other and their positions will be linked, and it sounds as if this was happening with your panorama. You need control points between the images in the stacks in order to align them, so in case you don't have them (linked stacked images can do without control points), you'll need another run of a control point generator - align_image_stack is popular for the specific case, but cpfind with settings to create a few more points than usual (try -- fullscale --sieve2size 5 -o %o %s) works well, too - and another optimizer run. Once everything is optimized, the minor shifts between the stacked images should be dealt with and you can proceed to let hugin create the fused panorama. You can check the quality of the alignment in the preview by setting the viewing mode to difference in the preview tab of the preview. If the overlap is generally very good, instead of creating a panorama from fused stacks you can also try and go the other way by creating an exposure fusion from an arbitrary arrangement, which has the added benefit that it lets you keep the intermediate layers to blend yourself if you want. Do trials with small output sizes to see what looks about right, then when you think you're getting there, crop out a typical section and do it higher-res, then when all seems fine have a go at the full pano. Sadly I couldn't find a way to make hugin keep the fused stacks before feeding them to enblend, which would be nice for you to play with (am I blind? or is there really no such option?). What you can do, though, is keep all the remapped images (no photometric correction, LDR) and enfuse them manually. They should be well-aligned now they have been made from unlinked stacks. If you're on windows, there are also the enfuse-align droplets, where you can just drag and drop sequences of images onto them and have an exposure fusion made from an aligned unlinked stack. This might be an option if you want to manually enfuse but not use hugin for it. And I'm sure there are many more possibilities... it's confusing at first, but you'll get there ;-) Kay -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/hugin-ptx
