From: "Antti Kurenniemi" 

It's not "hidden data", but AFAIK the jpg format allows a
thumbnail to be included in the file - so the thumbnail you see is not a
shrinked version of the actual image file, but it can even be a completely
different image. In this case the thumbnail was probably created from the
image before obscuring the face from the actual image.

Some viewers allow you to see / modify this thumbnail, but I've never
played with it myself so I can't name any right now.


Antti Kurenniemi

"Dave"  wrote in message
news:k3bpc1t60rgid3nlgf0m46mcu2b1in5hu9{at}4ax.com...
>I was searching for some old pictures tonight, paging through the
> thumbnails in Windows Explorer, when I noticed some anomalies --
> sometimes for cropped or edited images, the thumbnail shows the full
> frame or the unedited version of the image.  In one instance, where
> the face of a subject was obscured in the full size image, the face
> was visible in the thumbnail.
>
> Is there any sure-fire method for viewing this kind of hidden data in
> .jpg files?  Or for double-checking your own images before posting
> them in public to make sure there is no hidden information that
> someone else may be able to see?

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