title: Creating an image with PHP - Large file size
body: <h2>The Problem</h2>
  
  <p>I'm trying to resize a 260x310px PNG to 120x120px while also retaining the transparency and centring the image. I have included the function i'm using below, it works fine in terms of the appearance of the image, however the images created are alot bigger. Infact all the images appear to be 128kb (there are thousands I haven't looked at all of them) and a directory of 50,000 of these images is 1gb bigger despite the images being over half the size (in pixels).</p>
  
  <p>I imagine this is because PHP isn't doing any optimisation in the way that say Photoshop might. Is there anything I can do to optimise the image in PHP?</p>
  
  <h2>The Code</h2>
  
  <p>This is my Code:</p>
  
  <pre><code>if ($handle = opendir($mydir_path)) {
      while (false !== ($entry = readdir($handle))) {
          if(strpos($entry, '.png'))
          {
              resize($mydir_path.$entry);
          }
      }
      closedir($handle);
  }
  
  function resize($img_loc)
  {
      $mini_loc = str_replace('megapack', 'handheld_megapack', $img_loc);
  
      $canvas = imagecreatetruecolor(310, 310);
      imagefill($canvas, 0, 0, imagecolorallocatealpha($canvas, 255, 255, 255, 127));
      imagealphablending($canvas, false);
      imagesavealpha($canvas, true);
  
      $img = imagecreatefrompng($img_loc);
      imagecopy($canvas, $img, 25, 0, 0, 0, 260, 310);
  
      $resizedImg = imagecreatetruecolor('120', '120');
      imagefill($resizedImg, 0, 0, imagecolorallocatealpha($resizedImg, 255, 255, 255, 127));
      imagealphablending($resizedImg, false);
      imagesavealpha($resizedImg, true);
  
      imagecopyresampled($resizedImg, $canvas, 0, 0, 0, 0, '120', '120', '310', '310');
  
      $dirname = dirname($mini_loc);
  
      imagepng($resizedImg, $mini_loc, '0');
  
      chmod($mini_loc, 0666);
  
      return $mini_loc;
  }
  </code></pre>