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[Esteve Boix <esteveb@xxxxxxxxx>]

I've done further testing.

With smaller images, thus lower radius and iterations/samples, the
problem still arises.

I've done some tests with the "gegl" command line command, and it works
just fine. I can definitely apply the operator with something like:

gegl -p -o /home/esteve/1.png -x "<gegl><node
operation='gegl:c2g'><params><param name='radius'>1800</param><param
name='samples'>16</param><param
name='iterations'>16</param></params></node><node
operation='gegl:load'><params><param
name='path'>/home/esteve/2.png</param></params></node></gegl>"

It applies the operation and saves the result, so I'd say the problem
resides in the GIMP, not in GEGL, or at least in the link between the
two.

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https://bugs.launchpad.net/bugs/1514199

Title:
  GIMP's GEGL C2G operation hangs

Status in gimp package in Ubuntu:
  New

Bug description:
  When I run GEGL's C2G  operator:

  - The operation hangs (it does not crash, it just hangs) more or less
  in the middle of the process.

  - The operator works in rectangles. Some of these rectangles are
  obviously darker than the rest of the image.

  - I takes way longer than before. Maybe the parameters have changed
  their meaning or the internals have changed, and the iterations and
  samples have to be lower. I don't know right now.

  I usually run at a radius of 1600, 40 samples, 20 iterations on 16MPix
  images (4928 x 3264).

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: gimp 2.8.14-1ubuntu2
  ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
  Uname: Linux 4.2.0-17-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sun Nov  8 15:56:51 2015
  InstallationDate: Installed on 2014-12-22 (320 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  SourcePackage: gimp
  UpgradeStatus: No upgrade log present (probably fresh install)

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