PHP - watermarking images
<?php
function watermark_image($target, $wtrmrk_file, $newcopy)
{
// Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng($wtrmrk_file);
$im = imagecreatefromjpeg($target);
// Set the margins for the stamp and get the height/width of the stamp image
$marge_right = 10;
$marge_bottom = 10;
$sx = imagesx($stamp);
$sy = imagesy($stamp);
// Copy the stamp image onto our photo using the margin offsets and the photo
// width to calculate positioning of the stamp.
imagecopy($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp));
imagejpeg($im, $newcopy, 100);
// Output and free memory
imagedestroy($im);
return $newcopy;
}