Where can I get a copy of the SBIG Image format ? - I checked the tech support are of the diffraction site and could not see it there nor a search on these forums. Graham.
Go to http://diffractionlimited.com/support/sbig-archives/ and download the Applications Note Archive. In the ZIP file you will find a file called file_format.pdf That said, we recommend using the universal FITS format instead of SBIG format.