Below are the steps that I followed:
In my composer.json the following is added:
"require": { "imagine/Imagine": ">=0.2.8", "liip/imagine-bundle": "*@dev", .... }
Type the following command at a command prompt:
composer update Installing imagine/imagine (v0.4.0) Installing liip/imagine-bundle (dev-master f7d5e4d)
After updating the composer, my directory structure inside the provider folder is as follows:

Then update provider / composer / autoload_namespaces.php
'Imagine' => $vendorDir .'/imagine/Imagine/lib/', 'Liip\\ImagineBundle'=>$vendorDir . '/liip/imagine-bundle/',
Registered Package:
new Liip\ImagineBundle\LiipImagineBundle(),
Routing:
# app/config/routing.yml _imagine: resource: . type: imagine
config.yml
Added twig template file:
<img src="{{ asset('bundles/acmedemo/images/1.jpg') | imagine_filter('my_thumb') }}" />
Open localhost / symfony / web / app_dev.php / demo / hello / test
There was no thumbnail generation. While looking at the source, I found the line:
<img src="/symfony/web/app_dev.php/media/cache/my_thumb/symfony/web/bundles/acmedemo/images/1.jpg">
What did I miss? Can someone help me with this? I am using xampp 1.8 for windows xp with default settings
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