hugin-devs team mailing list archive

[Bruno Postle <696636@xxxxxxxxxxxxxxxxxx>]

I tried to do this myself, but I find the new Makefile system to be even
harder to comprehend than the old one :-(

The exiftool command modification is quite simple, we should add both a
'Software' and 'User Comment' EXIF tag, this sort of command works and
can be added to the existing (though I don't think the exact format of
the data is very important):

 exiftool -UserComment='Projection: 2, HFoV: 360, EV: 15.5, etc...'
-Software='Hugin 2010.5.0.2f3941e43176' output.jpg

We can optionally add new lines for pretty formatting (similar to
qtpfsgui) using the -E parameter and HTML character codes:

 exiftool -E -UserComment='Projection: Equirectangular (2)
HFoV:
360
' output.jpg

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https://bugs.launchpad.net/bugs/696636

Title:
  Hugin should write projection info to output

Status in Hugin - Panorama Tools GUI:
  Triaged

Bug description:
  When Hugin creates an output image it discards all the photometric and
  geometric information it knows about this image. Hugin ought to write
  metadata to the image that would allow Hugin to use the image as input
  at some time in the future.

  Important information is:

   1. Horizontal field of view.
   2. Projection and any relevant projection parameters.
   3. Cropping information, since otherwise the hfov isn't usable.
   4. EV.
   5. EMoR parameters since these are effectively transferred from the first photo in the project to the output.

  We could create fake sensor and focal length info, but this would only
  be credible for rectilinear output. So probably the only way to do
  this would be to write to the EXIF notes section much like
  qtpfsgui/luminance, e.g. this is typical qtpfsgui output (this is the
  actual format):

   Qtpfsgui 1.9.3 tonemapping parameters: 
   Operator: Mantiuk
   Parameters:
   Contrast Mapping factor: 0.1
   Saturation Factor: 2 
   Detail Factor: 1 
   ------
   PreGamma: 0.636

  We already require exiftool, this info can be added to the existing
  exiftool command in the .pto.mk stitching Makefile