Hello Jasem,
for gain I found to more or less standard keywords, which are GAIN or EGAIN, both measured in e-/ADU, for offset I could not find anything commonly used. In ccdciel, Patrick Chevalley decided to add following headers to fits files for Indi controlled cameras:

+ if gain>0 then Ffits.Header.Add('GAIN',gain,'Video gain');
+ if gamma>0 then Ffits.Header.Add('GAMMA',gamma,'Video gamma');
+ if offset>0 then Ffits.Header.Add('OFFSET',offset,'Video offset,brightness');

( sourceforge.net/p/ccdciel/code/602/ )

which was the only useful reference I could find...


Regards

Dirk

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