gistfile1.php

        $dataManager = $this->getContainer()->get('liip_imagine.data.manager');
        $filterManager = $this->getContainer()->get('liip_imagine.filter.manager');
        $assetManager = $this->getContainer()->get('eris_fo.assets_manager');
        $variationManager = $this->getContainer()->get('eris_fo.assets.variation_generator');

        // works using the custom data loader as set in imaginebundle config
        $fullSizeImagePath = '/images/content/advertising.png';
        $filters = $this->getContainer()->getParameter('assets_image_variations');
        $targetAssetsBucket = 'images';

        foreach ($filters as $filter) {
            $targetFileName = $variationManager->getVariationFileName($fullSizeImagePath, $filter);
            //var_dump($targetFileName);exit;

            $image = $dataManager->find($filter, $fullSizeImagePath);
            $response = $filterManager->applyFilter($image, $filter);
            $assetManager->uploadFileContentsToBucket($response->getContent(), $targetFileName, $targetAssetsBucket);
        }

updating the gist