Yes you can resize image
using that plugin
but you even don't need it as internally it also use OctoberCMS built-in Resize function
.
First you need to save it on disk and then resize it in-place.
for this you can use October Cms's in-built Resizer
https://octobercms.com/docs/api/october/rain/database/attach/resizer
You can also crop image if you need just read https://octobercms.com/docs/api/october/rain/database/attach/resizer#crop doc and you are good to go. There are lot more options if you need.
<?php namespace hardiksatasiya/...somethig;
use October\Rain\Database\Attach\Resizer;
// ...
$car= new Car();
$car->name = Input::get('name');
$car->photo = Input::file('photo');
$car->save();
// code to resize image
$width = 100;
$height = 100;
$options = []; // or ['mode' => 'crop']
Resizer::open($car->photo->getLocalPath()) // create from real path
->resize($width, $height, $options)
->save($car->photo->getLocalPath());
This code will open saved Image, Resize it and save it in same place.
If You get any problem please comment.