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[tduell <1529902@xxxxxxxxxxxxxxxxxx>]

I tried your file with hugin-7200:d185664c5ce1, and got this message...

Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT16'.
ERROR: caught exception: 
Precondition violation!
vigra::detail::read_image_bands_and_alpha: expecting exactly one alpha band
(/home/terry/rpmbuild/BUILD/hugin-2015.1.0/src/hugin_base/vigra_ext/impexalpha.hxx:119)

I then loaded your image into Darktable, and exported as tif tried
again, and got this message...

[terry@localhost Torsten]$ tca_correct -o v tca_issue_DT.tif
ERROR: caught exception: 
Precondition violation!
vigra::detail::read_image_bands_and_alpha: expecting exactly one alpha band
(/home/terry/rpmbuild/BUILD/hugin-2015.1.0/src/hugin_base/vigra_ext/impexalpha.hxx:119)

so looks like the issue can be reproduced.

Cheers,
Terry

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https://bugs.launchpad.net/bugs/1529902

Title:
  tca_correct fails with "expecting exactly one alpha band"

Status in Hugin:
  New

Bug description:
  Since revision 7033:5f45958ae420, tca_correct fails on my TIFFs with
  the following output:

  $ tca_correct -o v tca_issue.tiff
  ...
  ERROR: caught exception:
  Precondition violation!
  vigra::detail::read_image_bands_and_alpha: expecting exactly one alpha band
  (/home/user/hugin/src/hugin_base/vigra_ext/impexalpha.hxx:113)

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