Re: Extracting green channel from FITS

Posted by han.k on Mar 03, 2022; 10:23am
URL: http://astroimagej.170.s1.nabble.com/Extracting-green-channel-from-FITS-tp1750p1817.html

Hi Karen,
Yes it can be highly confusing. Lets talk about FITS X and FITS Y only. I see in astroimageJ you also have AstroimageJ X, Y

Having only BAYERPAT='RGGB'

FITS X =1 (odd)  FITS Y=1 (odd)   pixel is red.    
FITS X =2 (even)  FITS Y=1 (odd)   pixel is green.
FITS X =1 (odd)  FITS Y=2 (even)   pixel is green.    
FITS X =2 (even)  FITS Y=2 (even)   pixel is blue.    

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Nothing changes if you add:
ROWORDER= 'TOP-DOWN'           / Order of the rows in image array  
So this is the default.