hugin-devs team mailing list archive

[Christoph Spiel <cspiel@xxxxxxxxxx>]

Carl,

        The weird, bright pixels in dark areas are artifacts of the
LCMS color-conversions in so called open color spaces.  Experience has
shown that it is hard to catch all of them.  However, Enblend/Enfuse
have a lot of (undocumented) command-line parameters that control the
hedging of those outliers.  Please take a look at source file
"fixmath.h" in the "src" directory and check out for example `class
OptimizableLuminanceSpace'.  You can control _everything_ coded as
`parameter::as_*("foo-bar", ...)' from the command line, for example
the code reads
        parameter::as_boolean("mark-freaky-color-conversions", false)
so, you could say
        --parameter=mark-freaky-color-conversions=true
at the command line.

For a better understanding of what is going on in the color-space
conversion steps you will probably want to compile your Enblend and
Enfuse with `LOG_COLORSPACE_CONVERSION' or even
`LOG_COLORSPACE_CONVERSION_DETAIL'.  The make(1) variable
`EXTRACPPFLAGS' was made for endeavors like this:
        EXTRACPPFLAGS='-DLOG_COLORSPACE_CONVERSION -DLOG_COLORSPACE_CONVERSION_DETAIL'
Otherwise it will be enfusing-by-night.


On the technical side: all operations in "fixmath.h" only consider a
single, isolated pixel.  We could think of a median filter or a
Kuwahara filter that operates on a N-times-N region of pixels at a
later processing step that mops up the outliers without impacting the
"good" pixels too much.  Please send me your patches, if this idea
works out!


/cls

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https://bugs.launchpad.net/bugs/1709473

Title:
  Enfuse: artifacts - false colored pixels in dark regions

Status in Enblend:
  New

Bug description:
  enfuse sometimes produces false colored pixels around dark regions
  using the default options.

  When using the option "--blend-colorspace=identity" the artefacts
  don't show (at least with the attached example images).

  Tested with version 4.2  and 4.3-e93b798a0c5f. The artefacts show with
  both versions, although there are differences.

  
  Attached are sample images and the result images after using the included script. There is also a self-compiled binary of the enfuse version 4.3-e93b798a0c5f and a text file ("Info.txt") containing info about versions, operating system and hardware. 

  The result images 
  "default.tif" and "default_dev.tif"
  are the images made with default options,
  the images 
  "identity.tif" and "identity_dev.tif"
  are made with the option "--blend-colorspace=identity".

  The images
  "default_dev.tif"and "identity_dev.tif" are made with the development version 4.3-e93b798a0c5f

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