hugin-devs team mailing list archive

[KFJ <787387@xxxxxxxxxxxxxxxxxx>]

Am 28.02.2012 16:01, schrieb rew:
> Kay,
>
> How big is your output image?

400MB

> Does the problem go away if you make your output image size half that
> what it is now? (both X and Y).

... I'm not sure if I want to go down this road any further. With the 
original bug in enfuse, which seems to have been fixed by now, I managed 
to reduce the problem to a manageable size. I've tried the approach 
here, but failed. Even though I could reproduce the bug with the 
original big image set, it was exotic data, so it may just have been a 
freak incident never to show up again. I had to revert back to an 
earlier stable enblend version anyway, because the bleeding edge was too 
slow (even though I compiled the Release version and used 
--primary-seam-generator=nearest-feature-transform or whatever the 
relevant flag was called...).

> What happens if you start with horribly compressed jpg images? If you
> set the quality very low, they will become very ugly, but this doesn't
> matter for the computer.

I'd first have to create all the horribly compressed JPEGs... I may try 
again later, but just now I'm too busy with other stuff.

Kay

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https://bugs.launchpad.net/bugs/787387

Title:
  small artifacts in fused 16bit TIFFs

Status in Enblend:
  Confirmed

Bug description:
  When blending a set of 16bit TIFF images, I noticed artifacts in the
  output. Depending on the enfuse setting used, these occur in different
  places and look different. When I used the default setting, the
  artifacts looked like groups of coloured dots (see
  enfuse_problem_fused_default.tif) and when I used exposure only, they
  came as single pixels (see enfuse_problem_fused_only_exposure.tif),
  also see the respective jpg screenshots where the artifacts are
  enlarged. The images were created by hugin's nona, I tried several
  sizes and also the original unmodified images, the effects were the
  same. The 16bit TIFFs were created by digiKam's batch RAW import from
  Canon CR2, using conversion to 16bit and storage as TIFF as the only
  active processing steps. I converted the images to JPG with gimp, and
  when I fused the JPGs, there was no problem. I also opened the images
  with fotoxx and saved them in a different file but the same format, in
  which case the problem persisted. I suspect the problem may stem from
  the 16bit format. Here's my session which produced the flawed results:

  >enfuse enfuse_problem_[0-2].tif -o enfuse_problem_fused_default.tif
  enfuse: info: loading next image: enfuse_problem_0.tif 1/1
  enfuse: info: loading next image: enfuse_problem_1.tif 1/1
  enfuse: info: loading next image: enfuse_problem_2.tif 1/1
  >enfuse enfuse_problem_[0-2].tif --saturation-weight=0 -o enfuse_problem_fused_only_exposure.tif
  enfuse: info: loading next image: enfuse_problem_0.tif 1/1
  enfuse: info: loading next image: enfuse_problem_1.tif 1/1
  enfuse: info: loading next image: enfuse_problem_2.tif 1/1

  >enfuse --version
  enfuse 4.1-101796703d73

  I use a Kubuntu 11.4 system on an intel processor. Find enclosed a tar
  file of the files in this session.

  Kay

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