使用nginx为图片进行水印操作
打水印版nginx安装过程(centos)1.安装依赖组件
sudo yum install gd-devel pcre-devel libcurl-devel
2.下载nginx
(1)下载 wget http://nginx.org/download/nginx-1.9.6.tar.gz
(2)解压 tar -zxvf nginx-1.9.6.tar.gz
(3) 进入目录 cd nginx-1.9.6
3.下载水印功能源代码
https://github.com/intaro/nginx-image-filter-watermark
点击download zip下载
4.覆盖nginx中的代码
将下载的zip解压，将其中的ngx_http_image_filter_module.c文件覆盖到nginx源码中（/src/http/modules/http_image_filter_module.c）
5.编译安装nginx（假设nginx源码在usr/local/nginx/nginx-1.9.6中）
./configure --with-http_image_filter_module
--with-http_stub_status_module --with-http_ssl_module --with-http_sub_module--prefix=/usr/local/nginx/nginx-1.9.6
make
make install
6.配置
Example Usage
Base Usage:
location /img/ {
image_filter watermark;#开启水印
image_filter_watermark "PATH_TO_FILE";#水印文件位置
image_filter_watermark_position center-center;#水印位置
image_filter_jpeg_quality 95;#图片质量
image_filter_buffer 20M;#缓存
image_filter_watermark_width_from 400; # 打水印的图片最小宽带，只有大于这个宽带的才会打水印
image_filter_watermark_height_from 400;#打水印的图片最小高度，只有大于这个高度的才会打水印
}
Usage with resize and crop:
location ~ ^/r/(\d+|-)x(\d+|-)/c/(\d+|-)x(\d+|-)/(.+) {
set $resize_width$1;
set $resize_height $2;
set $crop_width$3;
set $crop_height $4;
alias /Users/goshan/Sites/Zot/Zot/web/$5;
try_files "" @404;
image_filter resize $resize_width $resize_height;
image_filter crop $crop_width $crop_height;
image_filter_jpeg_quality 95;
image_filter_buffer 2M;
image_filter_watermark_width_from 400; # Minimal width (after resize) of when to use watermark
image_filter_watermark_height_from 400;# Minimal height (after resize) of when to use watermark
image_filter_watermark "PATH_TO_FILE";
image_filter_watermark_position center-center;
}
7.注意事项
(1)水印文件必须是背景透明的文件
(2)如果要打水印的图片文件会很大，需将image_filter_buffer设置大一些，比如20M
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