Wow, Google worked on that one.  I've gotten used to stumping them lately and 
it was a relief that the first two sites were very useful.

http://astronomy.swin.edu.au/~pbourke/dataformats/tiff/
http://www.ee.cooper.edu/courses/course_pages/past_courses/EE458/TIFF/

The first site guides you through writing TIFFs.  The second is more 
informative and less practical looking and it waxes on about proprietary 
cruft.

To answer your question, it looks like the offset is four bytes right before 
the first image file directory (IFD).  I'm not sure why those four bytes are 
there or if you can use them as you like, but that's what they are.  

Good luck, brave media coder.

On Thursday 22 July 2004 10:29 am, John Hebert wrote:
> Howdy,
>
> I am trying to understand the TIFF file format and I
> came across a term: "file off-set". I kinda have an
> idea what this is, but I am not sure.
>
> I think it referring to a position in the file where
> actual image data starts, so that a header section can
> exist to provide meta-data about the image. (?)
>
> Can anyone define what a file off-set is or point me
> to a good explanation?
>
> Thanks,
> John
>
>
>
>
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