This pictures taken from Queensborough Bridge station in New York looks innocent. It probably says a lot for the 14 Kbytes that it occupies. It probably says different things to different people but it DOES say a lot.
It actually says a lot more than it can meet the eye. Right click and download the picture and then open it from Notepad or Wordpad or any other plain text editor. Scroll to the end of the text ...
Cool right ?
You can use any plain text editor to open up a jpeg image and insert anything you want after the end of the image text. The image still renders correctly, at least in windows system. If you are using any other system please let me know if it the picture displays correctly.
Note that: Notepad and Wordpad in Windows system are OK to view the message in the image but if you try to save a new message then the image does not display correctly anymore. Also note that manipulating the image with an image editor (photoshop, paint shop pro ...) will destroy all the hidden information.
If you want to write you own hidden messages in jpeg's try the Notepad 2 from flo's freeware site. In my opinion its an excelent replacement of the windows notepad . The trick might work for other picture format's, I am not sure, try it and let me know. Remember to hit enter after the last character of the image text and then start typing your message otherwise you might screw up the picture.
Just for the record I have been using this for some time now, I do not remember if I discovered it or read it somewhere perhaps everybody knows (and I am the last to know). Well either way I think its a fun way to send hidden messages to your friends without others knowing, so I thought I'd share.
From now on beware the next picture that arrives in you mailbox might have a hidden message from Al Qaida to you ;-)