encypting images

[Daniel A Dryden]

Hi,
I'm new to this list, and glad to be in good company.
My question is can gpg encrypt .jpegs .gifs etc... ??
Here's what I did: "gpg -ea foo.jpg ".
It encrypted with the --armour switch to ascii very nicely.
And it named it foo.jpg.gpg.asc
But when I ran: gpg -d foo, well,
here's the output:

[ddryden@Aiko$ gpg -d foo 
gpg: Warning: using insecure memory!
gpg: no valid OpenPGP data found.
gpg: decrypt_message failed: eof

So my question is, does gpg do image format encryption?
Many thanks in advance
Daniel Dryden
P.S. I hope I presented this clearly enough :)