Hi guys, im trying to use some gd functions to resize my images on upload. ive read tutorials and stuff on this and everything seems good, no errors. however my images stay the same. i want the file itself to be resized not just to display resized if that makes sense.

here is what i have..

function imgresize($img){
// Load image

$image = @imagecreatefromjpeg($img);
if ($image === false) { die ('Unable to open image'); }

// Get original width and height
$width = imagesx($image);
$height = imagesy($image);

// New width and height
$pos = strpos($img,"BIG.jpg");
if($pos === false){
$new_width = 201;
$new_height = 158;
}
else{
$new_width = 531;
$new_height = 480;
}

// Resample
$image_resized = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

}

can anyone explain what im doing rong.. as i feel i may not be understanding the functions properly.

thanks,

adrian