hugin-devs team mailing list archive

[tmodes <2111856@xxxxxxxxxxxxxxxxxx>]

16 bit images work fine in Hugin. These are only warnings.

For the first one: Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT16'.
This warning is issued by vigra. 16  bit images should have the sampleformat tag to correctly indicate the pixel format. It seems Lightroom is not writing this tag. If the format of the data is unsigned int this should not make any problems. (It would be a problem if the format of the pixel is e.g. float but not correctly marked in the tags.)

Second: enblend: warning: deduced output pixel type is "UINT16", but image type "JPEG"
enblend: warning: supports "UINT8" at best; will use "UINT8"
When merging 16 bit images the result will be also 16 bit. But the jpeg format can only store 8 bit images.
So enblend issues a warning and downscales the 16 bit values to 8 bit. So you loose some information - and so the warning is correctly to warn you about this issue.
If the jpeg output is fine for you this is nothing to worry - in this case you could also use 8 bit input images to save some space and also maybe speed up a little bit.

** Changed in: hugin
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2111856

Title:
  Issue with 16-bit TIFF from Adobe Lightroom

Status in Hugin:
  Invalid

Bug description:
  When I export raw images as 126.bit TIFF in Adobe Lightroom 5, Hugin
  outputs a warning like this when creating control points:

  Warning: TIFFDecoder: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE,
  guessing pixeltype 'UINT16'.

  Exiftools finds out this from the images (extract):

  Bits Per Sample                 : 16 16 16
  Photometric Interpretation      : RGB
  Samples Per Pixel               : 3
  Rows Per Strip                  : 16

  Later when Hugin assembles the panorama, there's another warning:

  enblend: warning: deduced output pixel type is "UINT16", but image type "JPEG"
  enblend: warning: supports "UINT8" at best;  will use "UINT8"

  (I consider JPEG to be good enough for the final panorama, and you
  can't really compare 8-bit RGB with 8-bit YCbCr, can you?)

  In essence: The messages seem to suggest that 16-bit images for input
  aren't fully supported.

  System info (partially redacted):
  Betriebssystem: Windows 10 (build 19045), 64-bit edition
  Architektur: 64 bit
  Freier Speicher: 7495296 kiB
  Aktive Codepage: 1252 (Western European Windows)

  Hugin
  Version: 2024.0.1.ead3af10a01a built by Thomas
  Ressourcen-Pfad: C:\Program Files\Hugin\share\hugin\xrc\
  Datenpfad: C:\Program Files\Hugin\share\hugin\data\
  Hugins Kamera- und Objektivdatenbank: C:\Users\redacted\AppData\Roaming\hugin\camlens.db
  Multi-Threading mittels C++11 std::thread und OpenMP
  Monitorprofile: C:\WINDOWS\system32\spool\drivers\color\SX2462W(6500K,120cd,G2.2).icm

  Bibliotheken
  wxWidgets: wxWidgets 3.3
  wxWidgets Library (wxMSW port)
  Version 3.3.0 (Unicode: wchar_t, debug level: 1),
  compiled at Nov 15 2024 16:59:10

  Runtime version of toolkit used is 10.0.

  libpano13: 2.9.22 
  Exiv2: 0.28.1
  SQLite3: 3.46.0
  Vigra: 1.12.1
  LittleCMS2: 2.14

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