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[Bug 2053287] Re: sometimes there are black patches/corners in blended images

 

Yes, that is weird.  You're quoting vigra code,

...
#if _MSC_VER >= 1900 || __cplusplus >= 201103L
            noexcept(false)
#else
            throw(PreconditionViolation)
#endif
...

and given that enblend uses c++17, the offending line shouldn't be used.
Does that problem not occur without my patches?  Do you run some
modified version of vigra?

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https://bugs.launchpad.net/bugs/2053287

Title:
  sometimes there are black patches/corners in blended images

Status in Enblend:
  New

Bug description:
  As has been known for a long time, enblend sometimes produces black
  patches in the corners of subimages.

  As we have discussed by email, I'd like to suggest a patch for that:
   -- patch1 contains the pyramid type to make the following simpler
   -- patch2 contains the actual change where the mask is corrected using both alpha layers prior to the actual blending step
   -- patch3 are two small functional changes that are unrelated to the main issue
   -- patch4 are modernisation and style improvements, that I just had to do while working on the code.  If you think some of them don't add enough (or any) value, feel free to drop some.

  cheers, lukas wirz

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