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[Bug 721136] Re: enblend creates an unexplainable black area.

 

Thomas, 
How good a debugger are you? 

This is a bug where a good programmer/debugger just has to spend a day
or two finding/fixing it.

This bug resides in the image library that allows the image to be moved
to disk if it becomes too large (I forgot its name). So reducing the
output image size will reduce/eliminate the problem. I think there is a
dangling pointer or memory corruption problem somehow....

The strategy to finding it would be as follows: 
* compile your own version from source. 
* verify it still happens. 
* Find the smallest example that causes the problem. 
* verify it doesn't happen when you disable that disk swapping of images. (e.g. add -m <largernumber> on the commandline). 
* check out valgrind for memory problems. See if it catches something. 
* start debugging.....

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https://bugs.launchpad.net/bugs/721136

Title:
  enblend creates an unexplainable black area.

Status in Enblend:
  Confirmed

Bug description:
  enblending       http://prive.bitwizard.nl/t80001.tif
  and                  http://prive.bitwizard.nl/t80003.tif
  results in          http://prive.bitwizard.nl/t8a.tif

  I cannot say I expected that black triangle in the output. My enblend
  was pulled from hg this morning (no changes) and built without
  imagecache or openMP. (imagecache causes corruption of the output
  similar but different to this. )

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References