2006.09.25 14:22 "Re: [Tiff] Handling of EXIF IFD in Libtiff", by Phil Harvey

i mean to say is there any other EXIF tag which have offset and on that offset may be some data, just like image data.

I don't know if this is what you mean, but the ExifIFD contains the InteropIFD and the maker notes, both of which may contain pointers to information that must be handled properly when rewriting the image.

- Phil