how install image science on window (first u need cygwin)

如何在window上安装image science
image science是一个类似rmagick的东西，不过image science声称比rmagick好，主要原因是rmagick，有memory leak，占用很多内存，大概就是这些原因吧。
1.安装cygwin
然后安装subversion，ruby，gcc，wget应该是在cygwin上安装

wget rubygem package and install it
gem install rails -y

4.google freeimage and download source and compile it
use:

make -f Makefile.cygwin
make -f Makefile.cygwin install

5.gem install image_science -y
安装完成。


trouble shooting
maybe you need setup HOME env
and on the cygwin maybe need

chown 755

for your user home directory