cjpeg -- converts to jpeg
djpeg -- converts from jpeg
jpegtran -- transformations like rotation
rdjpgco -- prints comment block
rdjpgco -- adds a comment block

Archive:  /www/aminet.net/doc//gfx/conv/jpeg-6b_bin.i386-aros.zip
 Length   Method    Size  Ratio   Date   Time   CRC-32    Name
--------  ------  ------- -----   ----   ----   ------    ----
       0  Stored        0   0%  02-02-06 20:58  00000000  jpeg-6b_bin.i386-aros/
  242023  Defl:N    96500  60%  02-02-06 19:48  844f9ba7  jpeg-6b_bin.i386-aros/cjpeg
  261045  Defl:N   106339  59%  02-02-06 19:48  e5597543  jpeg-6b_bin.i386-aros/djpeg
  252896  Defl:N   100913  60%  02-02-06 19:48  8ef44ac3  jpeg-6b_bin.i386-aros/jpegtran
  161344  Defl:N    63638  61%  02-02-06 19:48  337b538b  jpeg-6b_bin.i386-aros/rdjpgcom
  163669  Defl:N    64395  61%  02-02-06 19:48  6fc2c277  jpeg-6b_bin.i386-aros/wrjpgcom
   35050  Defl:N    20177  42%  08-23-97 01:44  a48daeaa  jpeg-6b_bin.i386-aros/testimg.bmp
    5756  Defl:N     5619   2%  07-29-95 19:57  e355059a  jpeg-6b_bin.i386-aros/testimg.jpg
  101484  Defl:N    77809  23%  07-29-95 19:57  fb3045d2  jpeg-6b_bin.i386-aros/testimg.ppm
    5645  Defl:N     5506   3%  07-29-95 19:57  60ead05d  jpeg-6b_bin.i386-aros/testimgp.jpg
    5770  Defl:N     5635   2%  07-29-95 19:57  805ffafa  jpeg-6b_bin.i386-aros/testorig.jpg
    5655  Defl:N     5508   3%  07-29-95 19:57  09539590  jpeg-6b_bin.i386-aros/testprog.jpg
   27171  Defl:N     9912  64%  03-21-98 02:34  063020c2  jpeg-6b_bin.i386-aros/usage.doc
     503  Defl:N      232  54%  02-02-06 20:47  2a9b1531  jpeg-6b_bin.i386-aros/test.aros
     235  Defl:N      110  53%  02-02-06 20:44  758fe979  jpeg-6b_bin.i386-aros/test.nix
--------          -------  ---                            -------
 1268246           562293  56%                            15 files