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[Lukas Wirz <l.wirz@xxxxxxxxxxxx>]

I think the problem I'm having is the same as
https://bugs.launchpad.net/enblend/+bug/766501 and
https://bugs.launchpad.net/enblend/+bug/785803.

Sorry for the duplication, but, for what it's worth, my example is
shorter and the bug is definitely still there (was there a few month
ago, anyway).

I can confirm, that (as people point out in the other two threads)
replacing --fine-mask by --coarse-mask (or vice versa) and slightly
rearranging the panorama, including zooming and rotating can remove
artifacts (or produce new artifacts).

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https://bugs.launchpad.net/bugs/1153546

Title:
  black artifacts after blending

Status in Enblend:
  New

Bug description:
  I'm frequently getting black artifacts on some blended photos (none or
  one in small projects, easily 5 to 10 artifacts in projects of more
  than 100 photos).

  The occurrence of artifacts does not depend on the output resolution.
  The shape, however, is dependent on the resolution.

  Appended are three photos.  On my machine blending yields the following output: 
  $ enblend -v -o foo.tif img_7306-73170000.tif img_7306-73170010.tif img_7306-73170011.tif --fine-mask
  enblend: info: loading next image: img_7306-73170000.tif 1/1
  enblend: info: loading next image: img_7306-73170010.tif 1/1
  enblend: images do not overlap - they will be combined without blending
  enblend: use the "-l" flag to force blending with a certain number of levels
  enblend: info: loading next image: img_7306-73170011.tif 1/1
  enblend: info: creating fine blend mask: 1/3 2/3 3/3
  enblend: info: optimizing 2 distinct seams
  enblend: info: Annealing Optimizer, s0: 1/4 2/4 3/4 4/4
  enblend: info: Annealing Optimizer, s1: 1/4 2/4 3/4 4/4
  enblend: info: Dijkstra Optimizer: s0 s1
  enblend: info: using 5 blending level(s)
  enblend: info: generating Gaussian pyramid:  g0 g1 g2 g3 g4
  enblend: info: generating Gaussian pyramid:  g0 g1 g2 g3 g4
  enblend: info: generating Laplacian pyramid: l0 l1 l2 l3 l4
  enblend: info: generating Gaussian pyramid:  g0 g1 g2 g3 g4
  enblend: info: generating Laplacian pyramid: l0 l1 l2 l3 l4
  enblend: info: blending layers:              l0 l1 l2 l3 l4
  enblend: info: collapsing Laplacian pyramid: l4 l3 l2 l1 l0
  enblend: info: writing final output


  The version is
  $ enblend -V
  enblend 4.1-700e60bc31b5

  Copyright (C) 2004-2012 Andrew Mihal.
  License GPLv2+: GNU GPL version 2 or later <http://www.gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.

  Written by Andrew Mihal and others.

  Please tell me if any additional output would be helpful.

  cheers, lukas

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