Here is a step by step installation for imagick on mac
brew install ghostscript
brew install ImageMagic –with-ghostscript
sudo pecl install imagick
if you don’t have pecl
cd /usr/local
culr -0 http://pear.php.net/go-pear.phar
sudo php -d detect_unicode=0 go-pear.phar
add extension=imagick.so to php.ini
restart webserver