Reduce image size on upload.

I have the following simple PHP resizer working okay.

<?php
ini_set('memory_limit', '2G');
include 'ImageResize.php';



ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);


$image = new \Eventviva\ImageResize('image.jpg');
$image->scale(10);
$image->save('image3.jpg')
?>

On the file upload I want to:

1. check file size ( > 1 meg reduce )
2. Keep the original as 26Large.jpg
3. Return the 26.jpg file into the editor.

Anyone done this already ?

Or where in the chain of event do I start ?

Cheers

Steve Warby