上传后使用LiipImagineBundle调整图像大小？

I'm using the LiipImagineBundle with Symfony 2.1 and would like to resize user uploaded images upon upload before saving them to the permanent filesystem location (to strip metadata, impose jpeg format, and limit the size of the file). I have to call a 'strip' and 'resize' filter from the controller and then save the filtered image from a temporary location to a folder of my choosing in the filesystem. with Symfony 2.