>I would suggest that editing the image and saving it (without actually making changes) is actually altering the compression level of the jpg So, in fact, the image has changed.
>
>If it's not actually changing the compression level, then I would guess the jpg header is being modified. Compare the files with a hex editor and then, if that is the case, strip out the header string prior to comparison.
>
>In the end, it sounds like you want more of a soundex() for images? Can't help there. Sorry.

Thanks for the feedback. A soundex() for images would be nice!