Assetic Compass configuration

_sprites.css

@import 'compass/utilities/sprites';
@import 'ui/*.png';

@include all-ui-sprites();

config.yml

# Assetic Configuration
assetic:
    debug:          "%kernel.debug%"
    use_controller: false
    #bundles:        [ ] # Commented out so I can use assetic in any bundle
    filters:
        cssrewrite: ~
        compass:
            http_path: /
            images_dir: %kernel.root_dir%/../app/Resources/public/img
            generated_images_path: %kernel.root_dir%/../web/img
            http_generated_images_path: /img