This is an easy example on how to hide files or secret messages in any image.
It makes sense when you want to hide some phone numbers into a picture with you and your girlfriend 
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Published by July 27th, 2007 in Howtos.
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July 27th, 2007 at 3:21 pm
An official term for this technique is called “Steganography”. This technique can be used to hide trademark information in images and other files. As the video mentioned, it is also a technique that can be used to pass messages. You can also password protect the archive file to make messages more difficult to intercept and view.
Caution: There are ways to detect hide files or messages inside of other files. So, don’t get too comfortable with using this technique as a foolproof way to pass secret messages.
July 28th, 2007 at 9:36 am
[…] Over at Cucirca they are showing how to hide stuff in a jpg. […]
July 29th, 2007 at 12:07 pm
that song/riff was annoying. cool tip though
August 1st, 2007 at 7:15 pm
yes, interesting tip but most probably i won’t use it
February 10th, 2008 at 3:22 am
Haha, the song WAS annoying but it must’ve been worth it to hide their phone number.
March 24th, 2008 at 5:59 pm
March 24th, 2008 at 5:59 pm
?