<?php  

header('content-type: image/jpeg');  

$watermark = imagecreatefrompng('images/col1.jpg');  
$watermark_width = imagesx($watermark);  
$watermark_height = imagesy($watermark);  
$image = imagecreatetruecolor($watermark_width, $watermark_height);  
//$image = imagecreatefromjpeg($_GET['src']);  
//$size = getimagesize($_GET['src']);  
$image = imagecreatefromjpeg("images/Sample.jpg");  
$size = getimagesize("images/Sample.jpg");  
$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);  

echo 'x=' . $dest_x;
echo 'y=' . $dest_y;  
?>