Image Download has some filters like Dimension, Image Type, Unloaded, Background Images. You may add prefix to keep the order in file browser is the same as in web page. The operation of Image Download is just simple and automated. You needn't be worry about the images that the dimension or type is unknown. With the powerful filter features, Image Download will directly save and automatically filter them with the filters you set, and add the correct file extension to those unknown type images.