Hello,
this post is only an information to someone who is interested in arithmetc encoded jpeg images.
At http://newsgroup.xnview.com/viewtopic.php?f=60&t=26327&p=105449&hilit=arithmetic+jpg#p105449 (http://newsgroup.xnview.com/viewtopic.php?f=60&t=26327&p=105449&hilit=arithmetic+jpg#p105449)
in XnView newsgroup I found this topic.
There are also some example jpeg files attached.
Best regards
Herb