<?PHP 
$image = imagecreatefromjpeg("deinBild.jpg"); 
$sx = imagesx($image); 
$sy = imagesy($image); 
echo "<img src='deinBild.jpg' width='$sx' height='$sy'>"; 
?> 

<?PHP 
$imgurl="deinBild.jpg"); 
$breite=100; 
$image = imagecreatefromjpeg($imgurl); 
$sx = imagesx($image); 
$sy = imagesy($image); 
$faktor = $sx/$breite; 
$hy = floor($sy/$faktor); 
imagecopyresized($image1, $image, 0,0, 0,0, $breite,$hy, $sx,$sy); 
imagejpeg($image1, "neu".$imgurl); 
?> 
<img src="neudeinBild.jpg">