hugin-devs team mailing list archive

[Seth Berrier <seth.berrier@xxxxxxxxx>]

WORKAROUND:
- Disable the enblend course mask and force use of the full resolution with the command line option '--fine-mask'

I was playing with resolution to create a minimal example that would
stitch quickly and I noticed that once the resolution was low enough the
course mask was disable automatically and then the white pixels
disappeared.  I tried the original resolution with the '--fine-mask'
option and the problem was gone!

So, the bug is still in there.  Something to do with the course mask
combined with an HDR workflow causes white pixels to appear around the
edges of the input images and at places like the 180 wrap and the zenith
these white pixels do not get blended out.

BTW: Before I found the workaround I also tried grabbing the latest
development code from mercurial and using that.  The problem still
exists there and can be fixed with the --fine-mask option.  There are
other problems with the 4.2-devel version as it exists right now so I'm
going to stick with 4.1.3 but just FYI this one does seem to be there in
the current main code branch.

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https://bugs.launchpad.net/bugs/1356551

Title:
  White pixels at 180 wrap and zenith for 16/32bit HDR Pano

Status in Enblend:
  New
Status in Hugin - Panorama Tools GUI:
  New

Bug description:
  When stitching my final pano for an HDR workflow I get a column of
  blank/white pixels near the equator at the 180 wrap and an entire row
  of blank/white pixels at the top.  Here's the basic pieces of my
  workflow:

  - Multiple exposures at 7 angles with samyang 8mm + pano head
  - Combined exposures to 7 HDR images using pfstools (sometimes exr files for 16bpp, other times tiff for 32bpp)
  - Use hugin to: mask out pano head arm, find control points, optimize positions, barrel and view and set output options
  - Stitch with a script using nona+enblend to equirec HDR image

  Can view example of the white pixels here:
  - you're facing the 180 wrap when it first comes up
  - zoom in at zenith to see the missing top pixel
  http://vr.rollerblading.es/pano/file?path=https://dl.dropboxusercontent.com/u/3340541/Panos/MuralLobby-Pano-LDR.jpg

  When I look at intermediate files I'm pretty sure it is enblend that is the source of the problem.  I've tried several different versions:
  - The stock version from the OSX binary on the source forge web site (v 4.1.1)
  - Enblend 4.1.2_2 compiled with macports
  - Enblend 4.1.3 compiled with macports (using my own updated portfile to grab the 4.1.3 tar ball)

  All three versions show the same problem.  I'll attach a screenshot
  pointing out the truant pixels as well as a minimal .pto file and the
  script I use for stitching.

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