[AstroPy] pyfits query: how to include a bit mask?
Russell E Owen
rowen at u.washington.edu
Mon Oct 10 19:37:32 EDT 2005
At 3:09 PM -0400 2005-10-07, Christopher Hanley wrote:
>Russell,
>
>My suggestion depends upon the type of FITS file you are creating.
>If you are dealing with FITS images, I would just add another
>extension to your FITS file containing the data quality flag values
>you wish to use. If you are writing FITS tables you could just add
>another column with the desired bit value.
Thank you for the helpful reply.
These are simple fits images (one per fits file).
If I add an extension then it will have to be at least 16 bits/pixel,
right? The two masks I want to add are only 1 bit/pixel each (I could
combine them into one, but they'd just have to be separated out again
at the other end).
Is there a natural and straightforward way to store the data in the
fits file more efficiently? Transmission time is an issue (we could
use compressed transmission, but that has its own headaches).
-- Russell
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