How to enable ImageMagick with Alfresco 5.1 on Windows?

1. Open {alfresco_installation_dir}\tomcat\bin\setenv.bat
2. Comment the by default magicbox settings by adding rem at the start of line. You will find default setting after this line rem ##### IMAGEMAGICK ENV #####
3. Add below lines
setx PATH "{alfresco_installation_dir}\imagemagick\bin;{alfresco_installation_dir}\imagemagick;{alfresco_installation_dir}\java\bin;%PATH%"
setx MAGICK_HOME "{alfresco_installation_dir}\imagemagick"
setx MAGICK_CODER_MODULE_PATH "{alfresco_installation_dir}\imagemagick\modules\coders"
setx MAGICK_CONFIGURE_PATH "{alfresco_installation_dir}\imagemagick"

Just restart alfresco and it's DONE.