ImageMagick outputs an empty image when using the `-morphology` paramter
Solution 1:
[...] I was using [ImageMagick version] 7 and after downgrading to 6.9 issue fixed [...]
Answer from OP's comment
[...] I was using [ImageMagick version] 7 and after downgrading to 6.9 issue fixed [...]
Answer from OP's comment