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[Alex Fliker <alexandru.barbovschi@xxxxxxxxx>]

Well, it seems that applying gamma 2.2 to the HDR images solves the
issue (which is strange on its own). But IMO it can not be accepted as
solution

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https://bugs.launchpad.net/bugs/1630172

Title:
  Unadequate stitching of a HDR panorama

Status in Enblend:
  New

Bug description:
  HDR files:

  https://fliker09.tk/sharedstuff/launchpad/1.hdr
  https://fliker09.tk/sharedstuff/launchpad/2.hdr
  https://fliker09.tk/sharedstuff/launchpad/3.hdr
  https://fliker09.tk/sharedstuff/launchpad/4.hdr

  
  Project file:

  https://fliker09.tk/sharedstuff/launchpad/panorama_8_panomodify.pto

  
  Execute:

  nona -m EXR_m -o panorama panorama_8_panomodify.pto

  I get 4 EXR files. For visualization I tone-mapped them using mai11
  operator:

  https://fliker09.tk/sharedstuff/launchpad/panorama0000.jpg
  https://fliker09.tk/sharedstuff/launchpad/panorama0001.jpg
  https://fliker09.tk/sharedstuff/launchpad/panorama0002.jpg
  https://fliker09.tk/sharedstuff/launchpad/panorama0003.jpg

  
  Looks all good. After that I try to stitch them using enblend 4.2 (nft and graph-cut algorithms) and verdandi 2016.2.0 (watershed algorithm):

  enblend --wrap=horizontal --blend-colorspace=IDENTITY -o panorama_original.exr --primary-seam-generator=nearest-feature-transform panorama000*.exr
  enblend --wrap=horizontal --blend-colorspace=IDENTITY -o panorama_original.exr panorama000*.exr
  verdandi --wrap --seam=blend --output=panorama_original.exr panorama000*.exr

  I again tone-mapped the results for visualization:

  https://fliker09.tk/sharedstuff/launchpad/hdr/

  I hope no commentaries are needed...

  
  Next, I decided to tone-map the nona's output:

  pfsin panorama000$i.exr | pfstmo_mai11 | pfsout panorama000$i.tiff
  convert panorama000$i.tiff -channel a -negate +channel panorama000$i.tif

  After that I stitched again:

  enblend --wrap=horizontal --compression=none --blend-colorspace=IDENTITY --fine-mask -o panorama_original.tif --primary-seam-generator=nearest-feature-transform panorama000*.tif
  enblend --wrap=horizontal --compression=none --blend-colorspace=IDENTITY -o panorama_original.tif panorama000*.tif
  verdandi --wrap --seam=blend --output=panorama_original.tif panorama000*.tif

  And here are the results:

  https://fliker09.tk/sharedstuff/launchpad/tmo/

  
  Difference is huge... Much better results! Now the question - why so bad with EXR files? Am I doing something wrong?

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