$picture = "lion.jpg";
$img = imagecreatefromjpeg($picture);	
	
$tmp=imagecreatetruecolor(400, 300);
imagecopyresampled($tmp, $img , 0, 0, 0, 0, 400, 300, 688, 600);
imagejpeg($tmp, "vmi.jpg",100);
	
imagedestroy($img);
imagedestroy($tmp);