It was thus said that the Great Brent Hilpert once stated:
  Tim Shoppa wrote:
 A Caplio RR120. JPG captures on digital cameras typically put some text
 as a comment at the front of the jpeg file, containing hardware, time, date,
 sometimes the shutter/aperture/flash settings, etc. 
 Neat, I did an ASCII dump on the jpg and see that info now. 
  You might want to search the net for a program called JHead.  You can use
it to extract the various sections (like comments, and thumbnails) out of
JPGs.  It's ANSI C so it should compile on just about anything.
  -spc (I use it to strip out comments, EXIF information and thumbnails
        before uploading pictures for the web---usually cuts the file
        size down by 12K or so ... )