watermark do obrazka

function watermark($im){
//$im je obrazok pre ktory nahravame watermark
$watermark = imagecreatefromgif('logo.gif');

$watermark_width = imagesx($watermark);
$watermark_height = imagesy($watermark);
$image = imagecreatetruecolor($watermark_width, $watermark_height);
$image = imagecreatefromjpeg($im);
$size = getimagesize($im);
//vypocitame polohu watermarku
$dest_x = $size[0] - $watermark_width; $placementX =  round($dest_x / 2);
//-5 znamena posun o 5 pixelov po osi x a y
$dest_y = $size[1] - $watermark_height;$placementY =  round($dest_y / 2);
//vytvorime novy obrazok
imagecopymerge($image, $watermark, $placementX, $placementY, 0, 0, $watermark_width, $watermark_height, 100);
//a ulozime uz s nahratym watermarkom
imagejpeg($image,$im,100);
imagedestroy($image);
imagedestroy($watermark);

}

imagecopy($image, $watermark, $placementX, $placementY, 0, 0, $watermark_width, $watermark_height);