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[Johannes Jaeger <1694540@xxxxxxxxxxxxxxxxxx>]

I also had the same issue.
I use the following parameter and now i don't have any problems:

--pre-assemble 
--primary-seam-generator=nearest-feature-transform   --> Don't use GraphCut Algo
--blend-colorspace=identity   --> Preventing color pixel in dark areas

Best Regards

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https://bugs.launchpad.net/bugs/1694540

Title:
  Enblend 4.2 generates stargate-like output for large pano

Status in Enblend:
  New
Status in enblend-enfuse package in Debian:
  New

Bug description:
  I am stitching a 1.1GPix panorama from 81 photos. I am observing that,
  repeatedly, the output panorama has a bizarre stargate/LSD like effect
  approximately two thirds of the way in (in order of photographs passed
  to it). I've attached a PNG showing the effect.

  I've attempted to output into PNG and into TIFF, both with the same
  issue. I haven't tried output into JPEG, because the panorama is
  bigger than what JPEG can hold.

  Enblend was invoked from Hugin. The only additional flag is "--fine-
  mask".

  Logs show nothing suspicious, except perhaps this warning:
  """
  [...]

  Blending images...
  enblend: warning: option "--fine-mask" combined with option "--primary-seam-generator=graphcut"
  enblend: warning: incompatible with mask optimization,
  enblend: note: defaulting to no optimization
  enblend: info: loading next image: 0000.tif 1/1
  enblend: info: loading next image: 0001.tif 1/1
  enblend: info: loading next image: 0002.tif 1/1
  enblend: info: loading next image: 0003.tif 1/1

  [...]

  enblend: info: loading next image: 0106.tif 1/1
  enblend: info: writing final output
  Updating metadata...
      1 image files updated
  """

  Enblend:
  $ dpkg-query -W enblend
  enblend	4.2-2
  $ lsb_release -d
  Description:	Debian GNU/Linux unstable (sid)

  Machine:
  Intel(R) Xeon(R) CPU E3-1231 v3 @ 3.40GHz
  32GB (4x8GB) RAM

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