compress-algo — use a specified compression algorithm
compress-algo n


Default is 2, which is RFC1950 compression. You may use 1 to use the old zlib version which is used by PGP. The default algorithm may give better results because the window size is not limited to 8K. If this is not used the OpenPGP behavior is used, i.e., the compression algorithm is selected from the preferences; note, that this can't be done if you do not encrypt the data.