在Windows 下让Emacs 支持打开jpeg png 图片
首先查看一下这个变量
(print image-library-alist)
它的值记录了，打开相应格式的图片格式需要用到的dll 文件，你需要下载这些dll
文件，放到emacs 安装目录 的bin 目录下，
比如： 我的
(print image-library-alist) ((xpm "libxpm.dll" "xpm4.dll" "libXpm-nox4.dll") (png "libpng14-14.dll" "libpng14.dll") (jpeg "jpeg62.dll" "libjpeg.dll" "jpeg-62.dll" "jpeg.dll") (tiff "libtiff3.dll" "libtiff.dll") (gif "giflib4.dll" "libungif4.dll" "libungif.dll") (svg "librsvg-2-2.dll") (gdk-pixbuf "libgdk_pixbuf-2.0-0.dll") (glib "libglib-2.0-0.dll") (gobject "libgobject-2.0-0.dll") (gnutls "libgnutls-26.dll"))
就是说要查看png 格式的文件，需要 "libpng14-14.dll"或 "libpng14.dll"
http://www.gtk.org/download/win32.php 网页上有libpng 的下载链接
http://ftp.gnome.org/pub/gnome/binaries/win32/dependencies/libpng_1.4.3-1_win32.zip