使用Nginx自动裁剪图片
使用Nginx进行图片自动裁剪合符规范的图片方法：
方法1：nginx自带模块
HttpImageFilterModule：http://wiki.nginx.org/HttpImageFilterModule
在编译要带上参数 --with-http_image_filter_module
配置nginx：
#vi nginx.conf
location ~* ^/img/pro/(.*)_RsT_(\d*)x(\d*)\.jpg$ {
root /data/store/newvideo/video/ZhongXun/Web_images;
rewrite /img/pro/(.*)_RsT_(\d*)x(\d*)\.jpg /$1 break;
image_filter resize $2 $3;
}
在使用方法1过程中，不知是我人品问题还是怎么回事，只要是要裁剪的图片超过1M，无论image_filter_buffer参数调成多大，总是报415 错误，网上也找不到什么解决办法，后来只能用方法2解决。
方法2：内嵌perl脚本实现
NginxEmbeddedPerlImageResize：http://wiki.nginx.org/NginxEmbeddedPerlImageResize
安装ImageMagick
# yum install ImageMagick ImageMagick-perl
在编译nginx要带上参数 --with-http_perl_module
配置nginx：
http{
perl_modules perl/lib;
perl_require resize.pm;
server {
.............
location ~* ^/img/pro/(.*)_RsT_(\d*)x(\d*)\.jpg$ {
root /data/store/images;
rewrite /img/pro/(.*)_RsT_(\d*)x(\d*)\.jpg /$1 break;
image_filter resize $2 $3;
error_page 415 = /$1_RsT_.$2x$3.jpg;
}
location /pic {
root /data/store/images/;
if (!-f $request_filename) {
rewrite ^(.*)(.jpg|.JPG|.gif|.GIF|.png|.PNG)$ /resize$1$2 last;
}
}
location /resize {
perl resize::handler;
}
}
}
resize.pm的内容如下：
package resize;
use nginx;
use Image::Magick;
our $base_dir="/data/store/images"; #注意，如果nginx是使用其它用户启动的，启动用户一定要用这个目录的写权限
our $image;
sub handler {
my $r = shift;
return DECLINED unless $r->uri =~ m/\.jpg_RsT_\.\d{1,}?x\d{1,}?\./;
my $uri=$r->uri;
$uri=~ s!^/resize!!;
my $dest_file="$base_dir/$uri";
my @path_tokens=split("/", $uri);
my $filename=pop @path_tokens;
my @filename_tokens=split('\.', $filename);
# We know the last part is the extension;
# We know the one before that is the dimensions
# We know that the one before that is the resize_to string
my $ext=pop @filename_tokens;
my $dimensions=pop @filename_tokens;
pop @filename_tokens;
$filename=join('.', @filename_tokens, $ext);
my $real_file_path=join("/", $base_dir, @path_tokens, $filename);
return DECLINED unless -f $real_file_path;
my ($width,$height)=split("x", $dimensions);
if ($height<1) {
$dimensions=$width;
}
$image= new Image::Magick;
$image->Read($real_file_path);
$image->Scale($dimensions);
$image->Write($dest_file);
$r->sendfile($dest_file);
return OK;
}
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