为什么80%的码农都做不了架构师？>>> 
brew info imagemagick
$ brew info imagemagick
imagemagick: stable 6.9.5-7 (bottled), HEAD
Tools and libraries to manipulate images in many formats
https://www.imagemagick.org/
/usr/local/Cellar/imagemagick/6.9.4-7 (1,460 files, 17.9M)
Poured from bottle on 2016-08-17 at 12:32:32
/usr/local/Cellar/imagemagick/6.9.5-7 (1,464 files, 22.5M)
Poured from bottle on 2016-08-17 at 16:24:42
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/imagemagick.rb
==> Dependencies
Build: xz ✔, pkg-config ✔
Required: libtool ✔, xz ✔
Recommended: jpeg ✔, libpng ✔, libtiff ✔, freetype ✔
Optional: fontconfig ✔, little-cms ✔, little-cms2 ✔, libwmf ✘, librsvg ✘, liblqr ✘, openexr ✘, ghostscript ✔, webp ✘, openjpeg ✘, fftw ✘, pango ✘
==> Options
--with-fftw
Compile with FFTW support
--with-fontconfig
Build with fontconfig support
--with-ghostscript
Build with ghostscript support
--with-hdri
Compile with HDRI support
--with-liblqr
Build with liblqr support
--with-librsvg
Build with librsvg support
--with-libwmf
Build with libwmf support
--with-little-cms
Build with little-cms support
--with-little-cms2
Build with little-cms2 support
--with-openexr
Build with openexr support
--with-openjpeg
Build with openjpeg support
--with-openmp
Compile with OpenMP support
--with-pango
Build with pango support
--with-perl
Compile with PerlMagick
--with-quantum-depth-16
Compile with a quantum depth of 16 bit
--with-quantum-depth-32
Compile with a quantum depth of 32 bit
--with-quantum-depth-8
Compile with a quantum depth of 8 bit
--with-webp
Build with webp support
--with-x11
Build with x11 support
--with-zero-configuration
Disables depending on XML configuration files
--without-freetype
Build without freetype support
--without-jpeg
Build without jpeg support
--without-libpng
Build without libpng support
--without-libtiff
Build without libtiff support
--without-magick-plus-plus
disable build/install of Magick++
--without-modules
Disable support for dynamically loadable modules
--without-opencl
Disable OpenCL
--without-threads
Disable threads support
--HEAD
Install HEAD version
■brew install ghostscript
pdf文件转换图片不成功需要安装ghostscript
MP4文件转换图片不成功需要安装ffmpeg