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Source of: /manual/en/image.examples.merged-watermark.php

<?php
include_once $_SERVER['DOCUMENT_ROOT'] . '/include/shared-manual.inc';
$TOC = array();
$PARENTS = array();
include_once dirname(__FILE__) ."/toc/image.examples.inc";
$setup = array (
  'home' =>
  array (
    0 => 'index.php',
    1 => 'PHP Manual',
  ),
  'head' =>
  array (
    0 => 'UTF-8',
    1 => 'en',
  ),
  'this' =>
  array (
    0 => 'image.examples.merged-watermark.php',
    1 => 'Using imagecopymerge to create a translucent watermark',
  ),
  'up' =>
  array (
    0 => 'image.examples.php',
    1 => 'Examples',
  ),
  'prev' =>
  array (
    0 => 'image.examples-watermark.php',
    1 => 'Adding watermarks to images using alpha channels',
  ),
  'next' =>
  array (
    0 => 'ref.image.php',
    1 => 'GD and Image Functions',
  ),
);
$setup["toc"] = $TOC;
$setup["parents"] = $PARENTS;
manual_setup($setup);

manual_header();
?>
<div id="image.examples.merged-watermark" class="section">
  <p class="para">
   </p><div class="example">
    <p><b>Example #1 Using <a href="function.imagecopymerge.php" class="function">imagecopymerge()</a> to create a translucent watermark</b></p>
    <div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;Load&nbsp;the&nbsp;stamp&nbsp;and&nbsp;the&nbsp;photo&nbsp;to&nbsp;apply&nbsp;the&nbsp;watermark&nbsp;to<br /></span><span style="color: #0000BB">$im&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #DD0000">'photo.jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;First&nbsp;we&nbsp;create&nbsp;our&nbsp;stamp&nbsp;image&nbsp;manually&nbsp;from&nbsp;GD<br /></span><span style="color: #0000BB">$stamp&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">70</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">99</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">69</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0x0000FF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">9</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">9</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">90</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">60</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0xFFFFFF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$im&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #DD0000">'photo.jpeg'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">20</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">20</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'libGD'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0x0000FF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">20</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">40</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'(c)&nbsp;2007-9'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0x0000FF</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Set&nbsp;the&nbsp;margins&nbsp;for&nbsp;the&nbsp;stamp&nbsp;and&nbsp;get&nbsp;the&nbsp;height/width&nbsp;of&nbsp;the&nbsp;stamp&nbsp;image<br /></span><span style="color: #0000BB">$marge_right&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$marge_bottom&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$sx&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$sy&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Merge&nbsp;the&nbsp;stamp&nbsp;onto&nbsp;our&nbsp;photo&nbsp;with&nbsp;an&nbsp;opacity&nbsp;(transparency)&nbsp;of&nbsp;50%<br /></span><span style="color: #0000BB">imagecopymerge</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">)&nbsp;-&nbsp;</span><span style="color: #0000BB">$sx&nbsp;</span><span style="color: #007700">-&nbsp;</span><span style="color: #0000BB">$marge_right</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">)&nbsp;-&nbsp;</span><span style="color: #0000BB">$sy&nbsp;</span><span style="color: #007700">-&nbsp;</span><span style="color: #0000BB">$marge_bottom</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Save&nbsp;the&nbsp;image&nbsp;to&nbsp;file&nbsp;and&nbsp;free&nbsp;memory<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'photo_stamp.png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="mediaobject">
     <div class="imageobject">
      <img src="images/21009b70229598c6a80eef8b45bf282b-watermark-merged.png" />
     </div>
    </div>
   </div><p>
   This example uses <a href="function.imagecopymerge.php" class="function">imagecopymerge()</a> to merge the stamp
   with our original image. Using this we can set the opacity of our stamp -
   in our example we&#039;ve set it to 50% opacity (another term for transparency).
   In practice this would be useful in copyright protection as semi-transparent
   watermarks are hard to remove yet allow viewers to see the image.
  </p>
 </div><?php manual_footer(); ?>
 
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