"dont compress" via command line

[Jonathan Chen -X (jonachen - The Armada Group, Inc. at Cisco)]

Hey all,

Just want to see if there is a workaround or not.  For rsyncd.conf,
there is the feature "dont compress" certain files that are already
compressed.   Is there a way to use the same feature with command line
rsync to not compress files that are already compressed?

I tried looking via rsync help command and it does not show or got a bit
confused with --exclude option.

Thanks!

Jonathan