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[tmodes <1406171@xxxxxxxxxxxxxxxxxx>]

Hi Terry,

you found very fast the only issue which remained (at least which I know). 
I thought that someone who is using 16 bit image will not use jpeg as output format. So I left this issue out.
Changeset feaf1a349739 provides fallback for some typical case (mostly to 8 bit for jpeg).
Some exotic conversion are left out. Let's wait if someone complains ;-)

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

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https://bugs.launchpad.net/bugs/1406171

Title:
  New builtin blender doesn't fallback to 8 bit for jpeg

Status in Hugin - Panorama Tools GUI:
  Confirmed

Bug description:
  Testing hugin-executor branch (6781:b0daf9c2446e) built on Fedora 20 x86_64.
  Using two input 16 bit tiff images, builtin blender, and attempting to stitch "exposure corrected ldr" with output to jpeg.
  Stitch fails, JPEH does not support requested pixel type UINT16".
  When using enblend falls back to UINT8 and completes stitch OK.
  The log file is as follows...
  ============================================
  Stitching panorama...
  ============================================

  Platform: Linux 3.17.7-200.fc20.x86_64 x86_64
  Version: 2014.1.0.b0daf9c2446e
  Working directory: /home/terry/Hugin/Problem-solve/MMacintosh/testcase/newtest
  Output prefix: 0007-0008-builtinblender

  Blender: internal
  ExifTool version: 9.76

  Number of active images: 2
  Output exposure value: 14.9
  Canvas size: 13876x7710
  ROI: (4685, 1721) - (8358, 5990) 
  FOV: 99x66
  Projection: Rectilinear(0)
  Using GPU for remapping: false

  Panorama Outputs:
  * Exposure corrected, low dynamic range

  First input image
  Number: 0
  Filename: /home/terry/Hugin/Problem-solve/MMacintosh/testcase/newtest/0007.tif
  Size: 2836x4272
  Projection: Normal (rectilinear)
  Response type: custom (EMoR)
  HFOV: 27
  Exposure value: 14.9

  
  Remapping and blending LDR images...
  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'.
  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'.
  Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 'UINT16'.
  caught exception: 
  Precondition violation!
  exportImage(): file type JPEG does not support requested pixel type UINT16.
  (/builddir/build/BUILD/vigra-1.9.0/src/impex/imageinfo.cxx:528)

  Cheers,
  Terry

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