title: Nginx and Watermarking
body: <p>I use <a href="http://sysoev.ru/nginx/docs/http/ngx_http_image_filter_module.html" rel="nofollow">ngx_http_image_filter_module</a> module for serving images in my project.
  Everything works perfectly. And now I want to dynamically put watermarks on images.</p>
  
  <p>I can't put them on upload because image sizes are often being changed.
  So, is that possible with nginx?</p>