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[Fotis <2089848@xxxxxxxxxxxxxxxxxx>]

Thank you for both the fix and explaining! I didn't get the chance to
test it with TIFFs that contain only non-zero values, but I understand
now the issue slightly better and will explore it further.

I did some reading on the topic but I'm not totally clear yet -  would
you say that black pixel/zeros are valid according to the  tiff specs
and it just happens that Hugin is struggling with them (eg. divide by
zero etc) so avoiding them is a way to overcome the issue? Or is it a
problem with the file encoding that I should point out to the Affinity
Photo team to have it fixed?


Out of curiosity, does the fix ignore these zero/black pixels or does it treat them as if they are 1 for int (or a very small positive value eg. 1.5e-45 for float)?

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https://bugs.launchpad.net/bugs/2089848

Title:
  possible 32bit TIFF mishandling

Status in Hugin:
  Fix Committed

Bug description:
  I'm testing an HDR workflow with 32bit HDR tiff files (BT.2020 Linear) and have noticed 2 issues:
  1) The thumbnails on the Photos tab have different gamma/color mapping to the previews in the Masks and Control points (I suspect that these three tabs are not using the same gamma curve).
  2) cpfind returns 0 control points.


  running on: 
  M1 Mac, macOS Sequoia 15.1.1
  cpfind 2024.0.1.ead3af10a01a built by Author name

  
  cpfind log:
  Hugin's cpfind 2024.0.1.ead3af10a01a built by Author name
  based on Pan-o-matic by Anael Orlinski
  Using 7 threads

  Project contains the following images:
  Image 0
    Imagefile: /Volumes/Ursula/trip photos/RAW to JXL (automated 1.5eV)/subs/P8240703 panorama (mono and color)/P8240703.tiff
    Remapped : no
  Image 1
    Imagefile: /Volumes/Ursula/trip photo/RAW to JXL (automated 1.5eV)/subs/P8240703 panorama (mono and color)/P8240704.tiff
    Remapped : no
  Image 2
    Imagefile: /Volumes/Ursula/trip photo/RAW to JXL (automated 1.5eV)/subs/P8240703 panorama (mono and color)/P8240705.tiff
    Remapped : no
  Image 3
    Imagefile: /Volumes/Ursula/trip photo/RAW to JXL (automated 1.5eV)/subs/P8240703 panorama (mono and color)/P8240706.tiff
    Remapped : no

  --- Analyze Images ---
  i0 : Analyzing image...
  i1 : Analyzing image...
  i3 : Analyzing image...
  i2 : Analyzing image...
  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT32'.
  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT32'.
  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT32'.
  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT32'.
  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT32'.
  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT32'.
  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT32'.
  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT32'.

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