On Sun, 25 May 2003 14:28:25 +0100, Bill Bedford wrote: >Can anyone suggest a way of automating the writing of comments fields >in jpegs? If at all possible, you should avoid rewriting the image of the JPEG file with a graphics program. You'll loose image quality. If at all possible, you should try to parse the JPEG file into (enough) blocks), and insert a comment block at a break point. That sounds like a job for Perl, for example. Ah, look, there exists a module to do the nitty gritty for you: JPEG::Comment: <http://search.cpan.org/author/IFROL/JPEG-Comment-02/> If you're not planning on using Perl but rather write your own, you could use it as an example. There's only one function there, of 26 lines. HTH, Bart.