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[Bug 787387] Re: small artifacts in fused 16bit TIFFs

 

Without small images to reproduce the problem, this is fly-by-night-in-
deep-fog hacking.

Let's see whether we can narrow down the issue.

1. Please make sure you are using the _non_ image-cache version of Enblend.
  We do not want to trip over an image-cache bug here.  Though the image-cache
  bugs always have shown up as line shaped never as isolated dots.

2. Compare the results when you blend with "--ciecam" and "--no-ciecam".  The
  no-CIECAM02 mode, i.e. plain RGB-blending never had any problems with weirdly
  colored pixels, whereas the CIECAM02 blending mode was problematic until the
  fix.

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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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References