Thanks, James.  I found wrjpgcom

On Friday 06 April 2001 19:56, you wrote:
> I just tried out opening a jpeg with a text editor (vim), and changing
> the comment manually.  This works fine if you make the new comment the
> same length as the old one.  If the new comment is longer, a warning
> is issued when opening about extraneous bytes, and if the new comment
> is smaller it doesn't open.  This can be fixed by opening with a hex
> editor, and changing the byte before the comment:
> xxd myfile.jpg > myfile.hex
> change the line:
> 0000010: 0048 0000 fffe 0007 4865 6c6c 6fff db00  .H......Hello...
> to:
> 0000010: 0048 0000 fffe 0004 4865 6c6c 6fff db00  .H......Hello...
> convert back to binary:
> xxd -r myfile.hex > myfile.jpg
> Then change "Hello" to "Hi" with a text editor like vim.
> And I figured that out without even looking at the documentation!  I
> bet it would only take a little C to make an automated jpeg comment
> changer.  Oh, and upon some looking around, there's one right on my
> system: wrjpgcom.  So read the man page on it and see if that's what
> you want.
> -James Smaby
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> Gimp-user mailing list

Rick Rosinski
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