Module cache_key 

Constants

cache_key

cache_key lets you specify an unique identifier for the given image. This will help Freya cache the image decoding, if the cache_key changes the old cache will be pruned and the image (changed or not) will be decoded again. cache_key is optinal but its recommended to be used, specialy for high quality images. You can pass any value that can be transformed into a string. Like a URL.