Enblend adds black to edges of some pictures in a pano sometimes when using include masks.

[Brandon]

Here are two examples http://kvtours.com/test-photos/CraterLake.jpg
and
http://kvtours.com/test-photos/Wheeler1.jpg

http://kvtours.com/test-photos/enblendBlackEdgeErrorTest.zip That is a 8.12mb test package for use with hugin.

The test package is an example that I just took out of a half pano that I was working on last nightt, that I doubt many people would have cause to do, but it was an easy one to show the problem with. In it you will find two pictures and a pto file. One of the pictures is in the pto file twice. The second copy has different light settings so that the sun is not quite so blown out. There is complete overlap on those two images. When I put a single include mask on the one that has a good sun I get a pretty good result, but the mask goes a bit further away from the sun than I want. So I add a second include mask to the other copy to keep most of the good colors and then I get the results shown in the Wheeler1.jpg

If I remove one of the include masks and instead use one include and one exclude I get the results that I want with no bugs. Remove both masks it works as expected as well.

On the crater lake one I did it a month ago and it more clearly shows the problem(I did not include it as a test package as it is a large set). My work flow on it, I was going along stitching small versions finding places where there were masking errors or that I needed more control points and correcting as I saw fit and then somewhere along the lines the black started showing up. At first it was just a little bit on the rock under the tri-pod. That caught my eye and I removed all the masks in that area and restitched. That did not remove the problem(I still had masks in other places.) I figured I could photoshop it so I continued and a few masks and restitches later I had problems showing up in places where there were and had never been a mask(that is the photo that I attached to this post). At that point I scrapped the project and started over and had no problems on my second try.

I have seen the bug with both the version of enblend that comes with hugin 2013 and enblend 4.1.3 win64 version.

I am running windows 7 on a desktop. A friend has had the same problems with windows 7 on a laptop.

For command line options I use the standard that hugin has plus I add in
-a --no-ciecam

Here is the thread where I first started talking about it.
https://groups.google.com/forum/#!msg/hugin-ptx/pQYSIjk7Af8/WyYBRSz_CgMJ

[Christoph Spiel (cspiel)]

Revision 8f4a08e6a317 should restore total correctness
    http://hg.code.sf.net/p/enblend/code/rev/8f4a08e6a317

Now, Enblend will abort if it encounters a near-overlap that
its algorithm is not able to handle.

We are not as strict as we could be, but most problems
should be caught by the new check. However, the borders
of the black alpha mask's are still untested.

You can play with the check's threshold parameter to fit it
to your images. Let us know, whether we ought to adapt
the default.

[Christoph Spiel (cspiel)]

Fixed in 4.2.