无损压缩图片心得(二)

无损压缩图片心得(二)

用户之前在发烧网参加的上传图片活动都没有经过无损压缩处理.想用脚本对一月内传上去的图片进行处理,但Amazon_S3服务集群上只能使用他们提供的一些简单的API.所以只能先down 下来,压缩处理后,再传上去覆盖原来的图片.

经过多次调试,最终写了个php的脚本对之进行处理:详见这里.

代码如下:

   1:  <?php

   2:  function compress_img ($source) {

   3:      $exts = array("png","bmp","gif","pnm","tiff");

   4:      $start_time = strtotime("-30 day");

   5:      exec("s3cmd ls s3://fever38-us-static/hotdeals/{$source}/ > ./tmp.txt");

   6:      $rs = file('./tmp.txt');

   7:   

   8:      foreach($rs as $line) {

   9:          $r =  array_filter(explode(' ', $line));

  10:          if(!empty($r[0])){

  11:              $r[0] = trim($r[0]);

  12:              $time = strtotime($r[0]);

  13:          }

  14:          if(!empty($time) && $time >= $start_time){

  15:              if(!empty($r[10])){

  16:                  $img = trim($r[10]);

  17:                  $path_info = pathinfo($r[10]);

  18:                  $ext = trim($path_info["extension"]);

  19:                  $file_name = strtolower(trim($path_info["basename"]));

  20:   

  21:                  exec("s3cmd get ".$img);

  22:                  exec("cp {$file_name} /mnt/heisoo/s3/{$source}/");

  23:   

  24:                  if (in_array($ext,$exts)) {

  25:                      system("/usr/bin/optipng -o5 ".$file_name);

  26:                  }

  27:                  if ($ext == "jpg" || $ext == "jpeg") {

  28:                      system("/usr/bin/jpegoptim -o --strip-all ".$file_name);

  29:                  }

  30:                  system("s3cmd put {$file_name} {$img} --guess-mime-type --add-header 'Cache-Control:max-age=31536000' --add-header 'Expires: Thu, 01 Dec 2014 16:00:00 GMT' --acl-public");

  31:                  unlink($file_name);

  32:              }

  33:          }

  34:      }

  35:   

  36:      unlink('./tmp.txt');

  37:  }

  38:   

  39:  compress_img("promotion_main_pic");

  40:  compress_img("src_thumb");

  41:  compress_img("uploadImage");

  42:  compress_img("dialog_image");

  43:  compress_img("joinPicture");

  44:  ?>