Re: Data Disk Format

[Paul Repacholi <prep@prep.synonet.com>]

Yes, it is one of the most common 'gotchas' of FITS. There was
a section in the FITS FAQ about this.

For some reason, FITS does *NOT* have a 16bit unsigned data type
in it. But ( from memory ) the SBIG wrote 'FITS' files that way
anyway!

With good astro ADs being 12 bit, or there abouts, a 16 bit unsigned
would seem a natural show in. Well, I was a comitee I guess.

Quick sanity check; you should never see a negative data point
in the raw data. Never. This would mean your telescope was acting
as a spotlight!

-- 
~paul
Paul Repacholi                               1 Crescent Rd.,
+61 (08) 9257-1001                           Kalamunda.
                                             West Australia 6076
Raw, Cooked or Well-done, it's all half baked.