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[rew <679024@xxxxxxxxxxxxxxxxxx>]

This is an enblend bug. Enblend sometimes takes along pixels from the
"black" (but alpha=0) pixels outside the remapped area.

The question is what enblend can do about the "wraparound" area. For a
good blend, it needs access to pixels "beyond the edge".

(for storing as a cylindrical projection image, it doesn't really matter
that much, but as postprocessing people might want to put it in a VR
tool or something where the seam at 0/360 or -180/180 becomes important.
)

Anyway, The only thing I can think of to fix this easily would be for
Nona (or other remappers) to generate an output image canvas from -190
to +190 and then later cropping at -180 - +180.  (i.e. duplicating
pixels between +170/-190 to  +180 and from -180 to -170 (+190).

** Changed in: hugin
       Status: New => Triaged

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Dark line at +/-180° on some circular pano
https://bugs.launchpad.net/bugs/679024
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Status in Hugin - Panorama Tools GUI: Triaged

Bug description:
On some circular pano (360°), I have a vertical dark line at the left/right junction. It occurs when then edge of a picture is just near the +/-180° limit. See the attached files.