imagemagick - How to prevent a dark edge with transparency using montage? -

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i'm trying montage semi-transparent icons 1 image using imagemagicks montage tool.

unfortunately, after every operation alpha bit of black showing everywhere on anti-aliased edges.

for example, these 2 icons:

icon 1
and
icon 2

after issuing

montage 1.png 2.png -background none montage.png

result in:

montaged 1 , 2

i've tried numerous combinations of alpha, background , changing option order , haven't found way prevent this. idea?

my system windows 8.1+cygwin, montage version is:

$ montage -version
version: imagemagick 6.9.1-3 q16 x86_64 2015-07-01
http://www.imagemagick.org copyright: copyright (c) 1999-2015
imagemagick studio llc license:
http://www.imagemagick.org/script/license.php features: dpc openmp
delegates (built-in): autotrace bzlib cairo fftw fontconfig freetype
fpx gslib jbig jng jpeg lcms lzma pangocairo png ps rsvg tiff webp x xml zlib

this looks version-specific bug, given command works fine on imagemagick 6.9.1-10 , using:

convert 1.png 2.png +append 3.png

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