RE: Bad pixel determination?

["Creager, Robert S" <CreagRS@LOUISVILLE.STORTEK.COM>]

Yes, I looked at all the pixels, and no, there is no IMAGESEC (or similar)
keyword in the FITS header.  I've just been looking through the tech notes,
but don't remember seeing any info about pixels not in the image (as in
detailing which ones are which).  I can see that dummy pixels could be
either 0 or 65535, but what about the others?  And should there be 79000 (I)
vs 2000 (V) bad pixels?  That "grouping" of pixels (value of 32321 in the V
image) are in the active frame, based on the coordinates.

> 
> When you computed the histogram did you look at _all_ of the
> pixels in the file or just those in the image section?
> 
> The image pixels are surrounded by non-image pixels.  So it
> is not surprising that if your histogram looked at non-image
> pixels to find many "bad" pixels.
> 
> I don't remember off hand if Tom's header files include an
> "IMAGESEC" (sp?) keyword.  
>