I fixed this "hole" thing by using command 
enblend --pre-assemble --fine-mask 
--primary-seam-generator=nearest-feature-transform -o result.jpg *.tif

"Preassemble" is for avoiding the warning "no overlapping area between inputs"
"Fine mask" is for a better mask detection 
"Nearest feature transform" is for using "fine mask", otherwise the default 
seam generator "graph cut" will cause error for fine mask (the difference 
between "graph cut" and "Nearest feature transform" is that the first one will 
just cut the graphs(faster) and the second one will try to avoid features when 
cutting graphs(slower))

I think you can also use something like 
enblend --pre-assemble --coarse-mask=12 -o result.jpg *.tif
instead of "fine mask",
because by default, enblend use coarse-mask=8, which in my case some times 
cause black holes. And when I tried to increase the coarse mask value, I got 
the result with no holes (and a less accurate seam between each adjacent 
images)(I guess the holes are caused by wrong seam calculation. When I ask 
enblend for a less accurate seam, as there is less calculation needed, the 
result is less possible to be wrong, so no holes anymore.). 


You could change the value after coarse-mask to see the difference if you 
increase(less accurate )/decrease(more accurate) it by setting --level=1.(by 
doing that, you could normally see the seams between images.)
enblend --pre-assemble --level=1 --coarse-mask=12 -o result12.jpg *.tif

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Developers, which is subscribed to Enblend.
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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