php class / function fails :(

[wmguk]

hey guys, im using this script to try and make images sepia

 

<?php 
$file = $_GET['image'];

require_once('class.image.php'); 
set_time_limit(720); 
$img = imagecreatefromjpeg('$file'); 

//Image::greyscale($img); 
Image::colourise($img, 'A09182'); 

header('Content-type: image/jpeg'); 
imagejpeg($img); 

?>

 

however when used, I just get a red cross for the image

 

any thoughts?

oh and the $file is correct, if i navigate directly to it, i see the image