set transparent background for shear

lfrohman <[email protected]>
Newsgroups gmane.comp.video.image-magick.user
Message-ID <[email protected]>
I want to create a skewed image in imagemagick. I use
convert a.png -shear 0x30 b.png
This works, but it sets up a black background on the
upper right and lower left triangles. I want these to be transparent,
but nothing I have tried has worked.
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