A similar approach has also been developed for use with zpaq, a compression format which stores the decompression algorithm as bytecode in the archive: [The co

A similar approach has also been developed for use with zpaq, a compression format which stores the decompression algorithm as bytecode in the archive: [The configuration] "jpg_test2" by Jan Ondrus compresses JPEG images (which are already compressed) by an additional 15%. It uses a preprocessor that expands Huffman codes to whole bytes, followed by context modeling. http://mattmahoney.net/dc/zpaqutil.html http://mattmahoney.net/dc/zpaqutil.html