GD Library - Cropping

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Hi all 

 

I'm trying to set up a script that will generate thumbnails for an image gallery using GD Library.

 

I'm using the following script, which resizes the image to 100px x 100px. It's working fine however I has hoping someone could help me edit it so that it shrinks the image by 50% then crops the thumbnail from the center.

 

<?php 

//Input file
$file = 'image.jpg'; 

//Output file
$save = 'new.jpg';

//Get image dimensions
list($width, $height) = getimagesize($file) ;

//Set new Dimensions
$modwidth = 100; 
$modheight = 100;

$tn = imagecreatetruecolor($modwidth, $modheight) ; 
$image = imagecreatefromjpeg($file) ; 
imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ; 

imagejpeg($tn, $save, 100); 

?>

 

Thanks a lot