Image watermark with PHP

Steps:

1. Load both images
2. Get size of both images
3. Copy watermark to main image
4. Print image to screen



PHP functions:
imagecreatefromgif
imagecreatefromjpeg
getimagesize
imagecopymerge
header
imagejpeg
imagedestroy

Watermark image:



Main image:

<?php  

$main_img   = "Happy_valentines_day.jpg"; // main big photo / picture
$watermark_img = "watermark.gif"; // use GIF or PNG, JPEG has no tranparency support
$padding   = 3; // distance to border in pixels for watermark image
$opacity  = 100; // image opacity for transparent watermark

$watermark  = imagecreatefromgif($watermark_img); // create watermark
$image   = imagecreatefromjpeg($main_img); // create main graphic

if(!$image || !$watermark) die("Error: main image or watermark could not be loaded!");


$watermark_size  = getimagesize($watermark_img);
$watermark_width  = $watermark_size[0];  
$watermark_height  = $watermark_size[1];  

$image_size  = getimagesize($main_img);  
$dest_x   = $image_size[0] - $watermark_width - $padding;  
$dest_y   = $image_size[1] - $watermark_height - $padding;


// copy watermark on main image
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, $opacity);


// print image to screen
header("content-type: image/jpeg");   
imagejpeg($image);  
imagedestroy($image);  
imagedestroy($watermark);  
?>