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php.htaccesswatermark

Htaccess and watermark

I want to know if it is possible to protect images in my host that are loaded from outside by adding a watermark using .htaccess?

That is, if another site uses my image URL http://example.com/1.jpg in a img tag in their own websites.

The plan is the when a foreign request comes to my host, I add a watermark to it and send it to the user browsing the foreign site.

Solution

  • What you basically want to do, is start with this tutorial:

    http://www.alistapart.com/articles/hotlinking/

    This shows you how to redirect images that come from external sites to a PHP page. Then, you can use that PHP page to watermark your image, with something like this:

    <?php
header('content-type: image/jpeg');
$watermark = imagecreatefrompng('watermark.png');
$watermark_width = imagesx($watermark);
$watermark_height = imagesy($watermark);
$image = imagecreatetruecolor($watermark_width, $watermark_height);
$image = imagecreatefromjpeg($_GET['pic']);
$size = getimagesize($_GET['pic']);
$dest_x = $size[0] - $watermark_width - 5;
$dest_y = $size[1] - $watermark_height - 5;
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 100);
imagejpeg($image);
imagedestroy($image);
imagedestroy($watermark);
?>