php script for create a watermark image.

Hi

I found this article when i stumbling. And i think this is informative for all of you friends.

List of things needed:
1. your image in any format
2. watermark image--in gif format with transparent background
3. script below with name (i.e. watermark.php)

code

<?php
// this script creates a watermarked image from an image file - can be a .jpg .gif or .png file
// where watermark.gif is a mostly transparent gif image with the watermark - goes in the same directory as this script
// where this script is named watermark.php
// call this script with an image tag
// <img src="watermark.php?path=imagepath"> where path is a relative path such as subdirectory/image.jpg
$imagesource = $_GET['path'];
$filetype = substr($imagesource,strlen($imagesource)-4,4);
$filetype = strtolower($filetype);
if($filetype == ".gif") $image = @imagecreatefromgif($imagesource);
if($filetype == ".jpg") $image = @imagecreatefromjpeg($imagesource);
if($filetype == ".png") $image = @imagecreatefrompng($imagesource);
if (!$image) die();
$watermark = @imagecreatefromgif('watermark.gif');
$imagewidth = imagesx($image);
$imageheight = imagesy($image);
$watermarkwidth = imagesx($watermark);
$watermarkheight = imagesy($watermark);
$startwidth = (($imagewidth - $watermarkwidth)/2);
$startheight = (($imageheight - $watermarkheight)/2);
imagecopy($image, $watermark, $startwidth, $startheight, 0, 0, $watermarkwidth, $watermarkheight);
imagejpeg($image);
imagedestroy($image);
imagedestroy($watermark);
?>

Name this script, i.e. watermark.php and call this script as following:
HTML

<img src="watermark.php?path=image_name.filetype">

the only thing you need to chage is "image_name.filetype" and of course you can have the relative path such as:
HTML

<img src="folder/watermark.php?path=folder/imagename">

The caution here is the script watermark.php and watermark.gif should be in the same location. watermark.gif should have transparent background.

As you can read it from the site, the location where the watermark.gif appears can be modified by adjusting this line of the code:
CODE

$startwidth = (($imagewidth - $watermarkwidth)/2);
$startheight = (($imageheight - $watermarkheight)/2);

To have it appear on the bottom right corner, try this:
CODE

$startwidth = (($imagewidth - $watermarkwidth) );
$startheight = (($imageheight - $watermarkheight) );

thanks