The binary distribution of ImageMagick does not include png support.
$ tar xf ImageMagick-x86_64-apple-darwin14.3.0.tar.gz
$ DYLD_LIBRARY_PATH=./ImageMagick-6.9.1/lib ./ImageMagick-6.9.1/bin/identify -list format | grep -i png
png support missing from Mac OS X binary distribution
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