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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